diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
index b691d37..7190536 100644
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -63,12 +63,13 @@
   FUNCTION_INST_GEP_ABBREV,
 };
 
-/// Class to manage the bitcode writing for all bitcode file types.
-/// Owns the BitstreamWriter, and includes the main entry point for
+/// Abstract class to manage the bitcode writing, subclassed for each bitcode
+/// file type. Owns the BitstreamWriter, and includes the main entry point for
 /// writing.
 class BitcodeWriter {
+protected:
   /// Pointer to the buffer allocated by caller for bitcode writing.
-  SmallVectorImpl<char> *Buffer;
+  const SmallVectorImpl<char> &Buffer;
 
   /// The stream created and owned by the BitodeWriter.
   BitstreamWriter Stream;
@@ -80,8 +81,8 @@
 public:
   /// Constructs a BitcodeWriter object, and initializes a BitstreamRecord,
   /// writing to the provided \p Buffer.
-  BitcodeWriter(SmallVectorImpl<char> *Buffer)
-      : Buffer(Buffer), Stream(*Buffer) {}
+  BitcodeWriter(SmallVectorImpl<char> &Buffer)
+      : Buffer(Buffer), Stream(Buffer) {}
 
   virtual ~BitcodeWriter() = default;
 
@@ -96,9 +97,6 @@
 
 protected:
   bool hasVSTOffsetPlaceholder() { return VSTOffsetPlaceholder != 0; }
-  uint64_t getVSTOffsetPlaceholder() { return VSTOffsetPlaceholder; }
-  SmallVectorImpl<char> &buffer() { return *Buffer; }
-  BitstreamWriter &stream() { return Stream; }
   void writeValueSymbolTableForwardDecl();
   void writeBitcodeHeader();
 };
@@ -106,7 +104,7 @@
 /// Class to manage the bitcode writing for a module.
 class ModuleBitcodeWriter : public BitcodeWriter {
   /// The Module to write to bitcode.
-  const Module *M;
+  const Module &M;
 
   /// Enumerates ids for all values in the module.
   ValueEnumerator VE;
@@ -123,16 +121,16 @@
 public:
   /// Constructs a ModuleBitcodeWriter object for the given Module,
   /// writing to the provided \p Buffer.
-  ModuleBitcodeWriter(const Module *M, SmallVectorImpl<char> *Buffer,
+  ModuleBitcodeWriter(const Module *M, SmallVectorImpl<char> &Buffer,
                       bool ShouldPreserveUseListOrder,
                       const ModuleSummaryIndex *Index, bool GenerateHash)
-      : BitcodeWriter(Buffer), M(M), VE(*M, ShouldPreserveUseListOrder),
+      : BitcodeWriter(Buffer), M(*M), VE(*M, ShouldPreserveUseListOrder),
         Index(Index), GenerateHash(GenerateHash) {
     // Save the start bit of the actual bitcode, in case there is space
     // saved at the start for the darwin header above. The reader stream
     // will start at the bitcode, and we need the offset of the VST
     // to line up.
-    BitcodeStartBit = stream().GetCurrentBitNo();
+    BitcodeStartBit = Stream.GetCurrentBitNo();
   }
 
 private:
@@ -263,7 +261,7 @@
 /// Class to manage the bitcode writing for a combined index.
 class IndexBitcodeWriter : public BitcodeWriter {
   /// The combined index to write to bitcode.
-  const ModuleSummaryIndex *Index;
+  const ModuleSummaryIndex &Index;
 
   /// Map that holds the correspondence between the GUID used in the combined
   /// index and a value id generated by this class to use in references.
@@ -275,14 +273,14 @@
 public:
   /// Constructs a IndexBitcodeWriter object for the given combined index,
   /// writing to the provided \p Buffer.
-  IndexBitcodeWriter(SmallVectorImpl<char> *Buffer,
-                     const ModuleSummaryIndex *Index)
+  IndexBitcodeWriter(SmallVectorImpl<char> &Buffer,
+                     const ModuleSummaryIndex &Index)
       : BitcodeWriter(Buffer), Index(Index) {
     // Assign unique value ids to all functions in the index for use
     // in writing out the call graph edges. Save the mapping from GUID
     // to the new global value id to use when writing those edges, which
     // are currently saved in the index in terms of GUID.
-    for (auto &II : *Index)
+    for (auto &II : Index)
       GUIDToValueIdMap[II.first] = ++GlobalValueId;
   }
 
@@ -413,7 +411,7 @@
   }
 
   // Emit the finished record.
-  stream().EmitRecord(Code, Vals, AbbrevToUse);
+  Stream.EmitRecord(Code, Vals, AbbrevToUse);
 }
 
 static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) {
@@ -533,7 +531,7 @@
   const std::vector<AttributeSet> &AttrGrps = VE.getAttributeGroups();
   if (AttrGrps.empty()) return;
 
-  stream().EnterSubblock(bitc::PARAMATTR_GROUP_BLOCK_ID, 3);
+  Stream.EnterSubblock(bitc::PARAMATTR_GROUP_BLOCK_ID, 3);
 
   SmallVector<uint64_t, 64> Record;
   for (unsigned i = 0, e = AttrGrps.size(); i != e; ++i) {
@@ -568,19 +566,19 @@
         }
       }
 
-      stream().EmitRecord(bitc::PARAMATTR_GRP_CODE_ENTRY, Record);
+      Stream.EmitRecord(bitc::PARAMATTR_GRP_CODE_ENTRY, Record);
       Record.clear();
     }
   }
 
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 void ModuleBitcodeWriter::writeAttributeTable() {
   const std::vector<AttributeSet> &Attrs = VE.getAttributes();
   if (Attrs.empty()) return;
 
-  stream().EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3);
+  Stream.EnterSubblock(bitc::PARAMATTR_BLOCK_ID, 3);
 
   SmallVector<uint64_t, 64> Record;
   for (unsigned i = 0, e = Attrs.size(); i != e; ++i) {
@@ -588,18 +586,18 @@
     for (unsigned i = 0, e = A.getNumSlots(); i != e; ++i)
       Record.push_back(VE.getAttributeGroupID(A.getSlotAttributes(i)));
 
-    stream().EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record);
+    Stream.EmitRecord(bitc::PARAMATTR_CODE_ENTRY, Record);
     Record.clear();
   }
 
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 /// WriteTypeTable - Write out the type table for a module.
 void ModuleBitcodeWriter::writeTypeTable() {
   const ValueEnumerator::TypeList &TypeList = VE.getTypes();
 
-  stream().EnterSubblock(bitc::TYPE_BLOCK_ID_NEW, 4 /*count from # abbrevs */);
+  Stream.EnterSubblock(bitc::TYPE_BLOCK_ID_NEW, 4 /*count from # abbrevs */);
   SmallVector<uint64_t, 64> TypeVals;
 
   uint64_t NumBits = VE.computeBitsRequiredForTypeIndicies();
@@ -609,7 +607,7 @@
   Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
   Abbv->Add(BitCodeAbbrevOp(0));  // Addrspace = 0
-  unsigned PtrAbbrev = stream().EmitAbbrev(Abbv);
+  unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv);
 
   // Abbrev for TYPE_CODE_FUNCTION.
   Abbv = new BitCodeAbbrev();
@@ -618,7 +616,7 @@
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
 
-  unsigned FunctionAbbrev = stream().EmitAbbrev(Abbv);
+  unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv);
 
   // Abbrev for TYPE_CODE_STRUCT_ANON.
   Abbv = new BitCodeAbbrev();
@@ -627,14 +625,14 @@
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
 
-  unsigned StructAnonAbbrev = stream().EmitAbbrev(Abbv);
+  unsigned StructAnonAbbrev = Stream.EmitAbbrev(Abbv);
 
   // Abbrev for TYPE_CODE_STRUCT_NAME.
   Abbv = new BitCodeAbbrev();
   Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT_NAME));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
-  unsigned StructNameAbbrev = stream().EmitAbbrev(Abbv);
+  unsigned StructNameAbbrev = Stream.EmitAbbrev(Abbv);
 
   // Abbrev for TYPE_CODE_STRUCT_NAMED.
   Abbv = new BitCodeAbbrev();
@@ -643,7 +641,7 @@
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
 
-  unsigned StructNamedAbbrev = stream().EmitAbbrev(Abbv);
+  unsigned StructNamedAbbrev = Stream.EmitAbbrev(Abbv);
 
   // Abbrev for TYPE_CODE_ARRAY.
   Abbv = new BitCodeAbbrev();
@@ -651,11 +649,11 @@
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // size
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, NumBits));
 
-  unsigned ArrayAbbrev = stream().EmitAbbrev(Abbv);
+  unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv);
 
   // Emit an entry count so the reader can reserve space.
   TypeVals.push_back(TypeList.size());
-  stream().EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals);
+  Stream.EmitRecord(bitc::TYPE_CODE_NUMENTRY, TypeVals);
   TypeVals.clear();
 
   // Loop over all of the types, emitting each in turn.
@@ -749,11 +747,11 @@
     }
 
     // Emit the finished record.
-    stream().EmitRecord(Code, TypeVals, AbbrevToUse);
+    Stream.EmitRecord(Code, TypeVals, AbbrevToUse);
     TypeVals.clear();
   }
 
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 static unsigned getEncodedLinkage(const GlobalValue::LinkageTypes Linkage) {
@@ -843,7 +841,7 @@
     Vals.push_back(Size);
     for (char Chr : C->getName())
       Vals.push_back((unsigned char)Chr);
-    stream().EmitRecord(bitc::MODULE_CODE_COMDAT, Vals, /*AbbrevToUse=*/0);
+    Stream.EmitRecord(bitc::MODULE_CODE_COMDAT, Vals, /*AbbrevToUse=*/0);
     Vals.clear();
   }
 }
@@ -862,16 +860,16 @@
   // hold the real VST offset. Must use fixed instead of VBR as we don't
   // know how many VBR chunks to reserve ahead of time.
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
-  unsigned VSTOffsetAbbrev = stream().EmitAbbrev(Abbv);
+  unsigned VSTOffsetAbbrev = Stream.EmitAbbrev(Abbv);
 
   // Emit the placeholder
   uint64_t Vals[] = {bitc::MODULE_CODE_VSTOFFSET, 0};
-  stream().EmitRecordWithAbbrev(VSTOffsetAbbrev, Vals);
+  Stream.EmitRecordWithAbbrev(VSTOffsetAbbrev, Vals);
 
   // Compute and save the bit offset to the placeholder, which will be
   // patched when the real VST is written. We can simply subtract the 32-bit
   // fixed size from the current bit number to get the location to backpatch.
-  VSTOffsetPlaceholder = stream().GetCurrentBitNo() - 32;
+  VSTOffsetPlaceholder = Stream.GetCurrentBitNo() - 32;
 }
 
 enum StringEncoding { SE_Char6, SE_Fixed7, SE_Fixed8 };
@@ -897,14 +895,14 @@
 /// Returns the bit offset to backpatch with the location of the real VST.
 void ModuleBitcodeWriter::writeModuleInfo() {
   // Emit various pieces of data attached to a module.
-  if (!M->getTargetTriple().empty())
-    writeStringRecord(bitc::MODULE_CODE_TRIPLE, M->getTargetTriple(),
+  if (!M.getTargetTriple().empty())
+    writeStringRecord(bitc::MODULE_CODE_TRIPLE, M.getTargetTriple(),
                       0 /*TODO*/);
-  const std::string &DL = M->getDataLayoutStr();
+  const std::string &DL = M.getDataLayoutStr();
   if (!DL.empty())
     writeStringRecord(bitc::MODULE_CODE_DATALAYOUT, DL, 0 /*TODO*/);
-  if (!M->getModuleInlineAsm().empty())
-    writeStringRecord(bitc::MODULE_CODE_ASM, M->getModuleInlineAsm(),
+  if (!M.getModuleInlineAsm().empty())
+    writeStringRecord(bitc::MODULE_CODE_ASM, M.getModuleInlineAsm(),
                       0 /*TODO*/);
 
   // Emit information about sections and GC, computing how many there are. Also
@@ -913,7 +911,7 @@
   std::map<std::string, unsigned> GCMap;
   unsigned MaxAlignment = 0;
   unsigned MaxGlobalType = 0;
-  for (const GlobalValue &GV : M->globals()) {
+  for (const GlobalValue &GV : M.globals()) {
     MaxAlignment = std::max(MaxAlignment, GV.getAlignment());
     MaxGlobalType = std::max(MaxGlobalType, VE.getTypeID(GV.getValueType()));
     if (GV.hasSection()) {
@@ -926,7 +924,7 @@
       }
     }
   }
-  for (const Function &F : *M) {
+  for (const Function &F : M) {
     MaxAlignment = std::max(MaxAlignment, F.getAlignment());
     if (F.hasSection()) {
       // Give section names unique ID's.
@@ -949,7 +947,7 @@
 
   // Emit abbrev for globals, now that we know # sections and max alignment.
   unsigned SimpleGVarAbbrev = 0;
-  if (!M->global_empty()) {
+  if (!M.global_empty()) {
     // Add an abbrev for common globals with no visibility or thread localness.
     BitCodeAbbrev *Abbv = new BitCodeAbbrev();
     Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR));
@@ -973,12 +971,12 @@
       Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
                                Log2_32_Ceil(SectionMap.size()+1)));
     // Don't bother emitting vis + thread local.
-    SimpleGVarAbbrev = stream().EmitAbbrev(Abbv);
+    SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv);
   }
 
   // Emit the global variable information.
   SmallVector<unsigned, 64> Vals;
-  for (const GlobalVariable &GV : M->globals()) {
+  for (const GlobalVariable &GV : M.globals()) {
     unsigned AbbrevToUse = 0;
 
     // GLOBALVAR: [type, isconst, initid,
@@ -1007,12 +1005,12 @@
       AbbrevToUse = SimpleGVarAbbrev;
     }
 
-    stream().EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse);
+    Stream.EmitRecord(bitc::MODULE_CODE_GLOBALVAR, Vals, AbbrevToUse);
     Vals.clear();
   }
 
   // Emit the function proto information.
-  for (const Function &F : *M) {
+  for (const Function &F : M) {
     // FUNCTION:  [type, callingconv, isproto, linkage, paramattrs, alignment,
     //             section, visibility, gc, unnamed_addr, prologuedata,
     //             dllstorageclass, comdat, prefixdata, personalityfn]
@@ -1036,12 +1034,12 @@
         F.hasPersonalityFn() ? (VE.getValueID(F.getPersonalityFn()) + 1) : 0);
 
     unsigned AbbrevToUse = 0;
-    stream().EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);
+    Stream.EmitRecord(bitc::MODULE_CODE_FUNCTION, Vals, AbbrevToUse);
     Vals.clear();
   }
 
   // Emit the alias information.
-  for (const GlobalAlias &A : M->aliases()) {
+  for (const GlobalAlias &A : M.aliases()) {
     // ALIAS: [alias type, aliasee val#, linkage, visibility]
     Vals.push_back(VE.getTypeID(A.getValueType()));
     Vals.push_back(A.getType()->getAddressSpace());
@@ -1052,26 +1050,26 @@
     Vals.push_back(getEncodedThreadLocalMode(A));
     Vals.push_back(A.hasUnnamedAddr());
     unsigned AbbrevToUse = 0;
-    stream().EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse);
+    Stream.EmitRecord(bitc::MODULE_CODE_ALIAS, Vals, AbbrevToUse);
     Vals.clear();
   }
 
   // Emit the ifunc information.
-  for (const GlobalIFunc &I : M->ifuncs()) {
+  for (const GlobalIFunc &I : M.ifuncs()) {
     // IFUNC: [ifunc type, address space, resolver val#, linkage, visibility]
     Vals.push_back(VE.getTypeID(I.getValueType()));
     Vals.push_back(I.getType()->getAddressSpace());
     Vals.push_back(VE.getValueID(I.getResolver()));
     Vals.push_back(getEncodedLinkage(I));
     Vals.push_back(getEncodedVisibility(I));
-    stream().EmitRecord(bitc::MODULE_CODE_IFUNC, Vals);
+    Stream.EmitRecord(bitc::MODULE_CODE_IFUNC, Vals);
     Vals.clear();
   }
 
   // Emit the module's source file name.
   {
-    StringEncoding Bits = getStringEncoding(M->getSourceFileName().data(),
-                                            M->getSourceFileName().size());
+    StringEncoding Bits = getStringEncoding(M.getSourceFileName().data(),
+                                            M.getSourceFileName().size());
     BitCodeAbbrevOp AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8);
     if (Bits == SE_Char6)
       AbbrevOpToUse = BitCodeAbbrevOp(BitCodeAbbrevOp::Char6);
@@ -1083,19 +1081,18 @@
     Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_SOURCE_FILENAME));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
     Abbv->Add(AbbrevOpToUse);
-    unsigned FilenameAbbrev = stream().EmitAbbrev(Abbv);
+    unsigned FilenameAbbrev = Stream.EmitAbbrev(Abbv);
 
-    for (const auto P : M->getSourceFileName())
+    for (const auto P : M.getSourceFileName())
       Vals.push_back((unsigned char)P);
 
     // Emit the finished record.
-    stream().EmitRecord(bitc::MODULE_CODE_SOURCE_FILENAME, Vals,
-                        FilenameAbbrev);
+    Stream.EmitRecord(bitc::MODULE_CODE_SOURCE_FILENAME, Vals, FilenameAbbrev);
     Vals.clear();
   }
 
   // If we have a VST, write the VSTOFFSET record placeholder.
-  if (M->getValueSymbolTable().empty())
+  if (M.getValueSymbolTable().empty())
     return;
   writeValueSymbolTableForwardDecl();
 }
@@ -1133,7 +1130,7 @@
   Value *V = MD->getValue();
   Record.push_back(VE.getTypeID(V->getType()));
   Record.push_back(VE.getValueID(V));
-  stream().EmitRecord(bitc::METADATA_VALUE, Record, 0);
+  Stream.EmitRecord(bitc::METADATA_VALUE, Record, 0);
   Record.clear();
 }
 
@@ -1146,9 +1143,9 @@
            "Unexpected function-local metadata");
     Record.push_back(VE.getMetadataOrNullID(MD));
   }
-  stream().EmitRecord(N->isDistinct() ? bitc::METADATA_DISTINCT_NODE
-                                      : bitc::METADATA_NODE,
-                      Record, Abbrev);
+  Stream.EmitRecord(N->isDistinct() ? bitc::METADATA_DISTINCT_NODE
+                                    : bitc::METADATA_NODE,
+                    Record, Abbrev);
   Record.clear();
 }
 
@@ -1162,7 +1159,7 @@
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
-  return stream().EmitAbbrev(Abbv);
+  return Stream.EmitAbbrev(Abbv);
 }
 
 void ModuleBitcodeWriter::writeDILocation(const DILocation *N,
@@ -1177,7 +1174,7 @@
   Record.push_back(VE.getMetadataID(N->getScope()));
   Record.push_back(VE.getMetadataOrNullID(N->getInlinedAt()));
 
-  stream().EmitRecord(bitc::METADATA_LOCATION, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_LOCATION, Record, Abbrev);
   Record.clear();
 }
 
@@ -1192,7 +1189,7 @@
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
-  return stream().EmitAbbrev(Abbv);
+  return Stream.EmitAbbrev(Abbv);
 }
 
 void ModuleBitcodeWriter::writeGenericDINode(const GenericDINode *N,
@@ -1208,7 +1205,7 @@
   for (auto &I : N->operands())
     Record.push_back(VE.getMetadataOrNullID(I));
 
-  stream().EmitRecord(bitc::METADATA_GENERIC_DEBUG, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_GENERIC_DEBUG, Record, Abbrev);
   Record.clear();
 }
 
@@ -1224,7 +1221,7 @@
   Record.push_back(N->getCount());
   Record.push_back(rotateSign(N->getLowerBound()));
 
-  stream().EmitRecord(bitc::METADATA_SUBRANGE, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_SUBRANGE, Record, Abbrev);
   Record.clear();
 }
 
@@ -1235,7 +1232,7 @@
   Record.push_back(rotateSign(N->getValue()));
   Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
 
-  stream().EmitRecord(bitc::METADATA_ENUMERATOR, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_ENUMERATOR, Record, Abbrev);
   Record.clear();
 }
 
@@ -1249,7 +1246,7 @@
   Record.push_back(N->getAlignInBits());
   Record.push_back(N->getEncoding());
 
-  stream().EmitRecord(bitc::METADATA_BASIC_TYPE, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_BASIC_TYPE, Record, Abbrev);
   Record.clear();
 }
 
@@ -1269,7 +1266,7 @@
   Record.push_back(N->getFlags());
   Record.push_back(VE.getMetadataOrNullID(N->getExtraData()));
 
-  stream().EmitRecord(bitc::METADATA_DERIVED_TYPE, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_DERIVED_TYPE, Record, Abbrev);
   Record.clear();
 }
 
@@ -1293,7 +1290,7 @@
   Record.push_back(VE.getMetadataOrNullID(N->getTemplateParams().get()));
   Record.push_back(VE.getMetadataOrNullID(N->getRawIdentifier()));
 
-  stream().EmitRecord(bitc::METADATA_COMPOSITE_TYPE, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_COMPOSITE_TYPE, Record, Abbrev);
   Record.clear();
 }
 
@@ -1304,7 +1301,7 @@
   Record.push_back(N->getFlags());
   Record.push_back(VE.getMetadataOrNullID(N->getTypeArray().get()));
 
-  stream().EmitRecord(bitc::METADATA_SUBROUTINE_TYPE, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_SUBROUTINE_TYPE, Record, Abbrev);
   Record.clear();
 }
 
@@ -1315,7 +1312,7 @@
   Record.push_back(VE.getMetadataOrNullID(N->getRawFilename()));
   Record.push_back(VE.getMetadataOrNullID(N->getRawDirectory()));
 
-  stream().EmitRecord(bitc::METADATA_FILE, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_FILE, Record, Abbrev);
   Record.clear();
 }
 
@@ -1340,7 +1337,7 @@
   Record.push_back(N->getDWOId());
   Record.push_back(VE.getMetadataOrNullID(N->getMacros().get()));
 
-  stream().EmitRecord(bitc::METADATA_COMPILE_UNIT, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_COMPILE_UNIT, Record, Abbrev);
   Record.clear();
 }
 
@@ -1367,7 +1364,7 @@
   Record.push_back(VE.getMetadataOrNullID(N->getDeclaration()));
   Record.push_back(VE.getMetadataOrNullID(N->getVariables().get()));
 
-  stream().EmitRecord(bitc::METADATA_SUBPROGRAM, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_SUBPROGRAM, Record, Abbrev);
   Record.clear();
 }
 
@@ -1380,7 +1377,7 @@
   Record.push_back(N->getLine());
   Record.push_back(N->getColumn());
 
-  stream().EmitRecord(bitc::METADATA_LEXICAL_BLOCK, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_LEXICAL_BLOCK, Record, Abbrev);
   Record.clear();
 }
 
@@ -1392,7 +1389,7 @@
   Record.push_back(VE.getMetadataOrNullID(N->getFile()));
   Record.push_back(N->getDiscriminator());
 
-  stream().EmitRecord(bitc::METADATA_LEXICAL_BLOCK_FILE, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_LEXICAL_BLOCK_FILE, Record, Abbrev);
   Record.clear();
 }
 
@@ -1405,7 +1402,7 @@
   Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
   Record.push_back(N->getLine());
 
-  stream().EmitRecord(bitc::METADATA_NAMESPACE, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_NAMESPACE, Record, Abbrev);
   Record.clear();
 }
 
@@ -1418,7 +1415,7 @@
   Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
   Record.push_back(VE.getMetadataOrNullID(N->getRawValue()));
 
-  stream().EmitRecord(bitc::METADATA_MACRO, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_MACRO, Record, Abbrev);
   Record.clear();
 }
 
@@ -1431,7 +1428,7 @@
   Record.push_back(VE.getMetadataOrNullID(N->getFile()));
   Record.push_back(VE.getMetadataOrNullID(N->getElements().get()));
 
-  stream().EmitRecord(bitc::METADATA_MACRO_FILE, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_MACRO_FILE, Record, Abbrev);
   Record.clear();
 }
 
@@ -1442,7 +1439,7 @@
   for (auto &I : N->operands())
     Record.push_back(VE.getMetadataOrNullID(I));
 
-  stream().EmitRecord(bitc::METADATA_MODULE, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_MODULE, Record, Abbrev);
   Record.clear();
 }
 
@@ -1453,7 +1450,7 @@
   Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
   Record.push_back(VE.getMetadataOrNullID(N->getType()));
 
-  stream().EmitRecord(bitc::METADATA_TEMPLATE_TYPE, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_TEMPLATE_TYPE, Record, Abbrev);
   Record.clear();
 }
 
@@ -1466,7 +1463,7 @@
   Record.push_back(VE.getMetadataOrNullID(N->getType()));
   Record.push_back(VE.getMetadataOrNullID(N->getValue()));
 
-  stream().EmitRecord(bitc::METADATA_TEMPLATE_VALUE, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_TEMPLATE_VALUE, Record, Abbrev);
   Record.clear();
 }
 
@@ -1485,7 +1482,7 @@
   Record.push_back(VE.getMetadataOrNullID(N->getRawVariable()));
   Record.push_back(VE.getMetadataOrNullID(N->getStaticDataMemberDeclaration()));
 
-  stream().EmitRecord(bitc::METADATA_GLOBAL_VAR, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_GLOBAL_VAR, Record, Abbrev);
   Record.clear();
 }
 
@@ -1501,7 +1498,7 @@
   Record.push_back(N->getArg());
   Record.push_back(N->getFlags());
 
-  stream().EmitRecord(bitc::METADATA_LOCAL_VAR, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_LOCAL_VAR, Record, Abbrev);
   Record.clear();
 }
 
@@ -1513,7 +1510,7 @@
   Record.push_back(N->isDistinct());
   Record.append(N->elements_begin(), N->elements_end());
 
-  stream().EmitRecord(bitc::METADATA_EXPRESSION, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_EXPRESSION, Record, Abbrev);
   Record.clear();
 }
 
@@ -1529,7 +1526,7 @@
   Record.push_back(N->getAttributes());
   Record.push_back(VE.getMetadataOrNullID(N->getType()));
 
-  stream().EmitRecord(bitc::METADATA_OBJC_PROPERTY, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_OBJC_PROPERTY, Record, Abbrev);
   Record.clear();
 }
 
@@ -1543,7 +1540,7 @@
   Record.push_back(N->getLine());
   Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
 
-  stream().EmitRecord(bitc::METADATA_IMPORTED_ENTITY, Record, Abbrev);
+  Stream.EmitRecord(bitc::METADATA_IMPORTED_ENTITY, Record, Abbrev);
   Record.clear();
 }
 
@@ -1552,26 +1549,26 @@
   Abbv->Add(BitCodeAbbrevOp(bitc::METADATA_NAME));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
-  return stream().EmitAbbrev(Abbv);
+  return Stream.EmitAbbrev(Abbv);
 }
 
 void ModuleBitcodeWriter::writeNamedMetadata(
     SmallVectorImpl<uint64_t> &Record) {
-  if (M->named_metadata_empty())
+  if (M.named_metadata_empty())
     return;
 
   unsigned Abbrev = createNamedMetadataAbbrev();
-  for (const NamedMDNode &NMD : M->named_metadata()) {
+  for (const NamedMDNode &NMD : M.named_metadata()) {
     // Write name.
     StringRef Str = NMD.getName();
     Record.append(Str.bytes_begin(), Str.bytes_end());
-    stream().EmitRecord(bitc::METADATA_NAME, Record, Abbrev);
+    Stream.EmitRecord(bitc::METADATA_NAME, Record, Abbrev);
     Record.clear();
 
     // Write named metadata operands.
     for (const MDNode *N : NMD.operands())
       Record.push_back(VE.getMetadataID(N));
-    stream().EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0);
+    Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0);
     Record.clear();
   }
 }
@@ -1582,7 +1579,7 @@
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # of strings
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // offset to chars
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
-  return stream().EmitAbbrev(Abbv);
+  return Stream.EmitAbbrev(Abbv);
 }
 
 /// Write out a record for MDString.
@@ -1615,7 +1612,7 @@
     Blob.append(cast<MDString>(MD)->getString());
 
   // Emit the final record.
-  stream().EmitRecordWithBlob(createMetadataStringsAbbrev(), Record, Blob);
+  Stream.EmitRecordWithBlob(createMetadataStringsAbbrev(), Record, Blob);
   Record.clear();
 }
 
@@ -1647,30 +1644,30 @@
 }
 
 void ModuleBitcodeWriter::writeModuleMetadata() {
-  if (!VE.hasMDs() && M->named_metadata_empty())
+  if (!VE.hasMDs() && M.named_metadata_empty())
     return;
 
-  stream().EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
+  Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
   SmallVector<uint64_t, 64> Record;
   writeMetadataStrings(VE.getMDStrings(), Record);
   writeMetadataRecords(VE.getNonMDStrings(), Record);
   writeNamedMetadata(Record);
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 void ModuleBitcodeWriter::writeFunctionMetadata(const Function &F) {
   if (!VE.hasMDs())
     return;
 
-  stream().EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
+  Stream.EnterSubblock(bitc::METADATA_BLOCK_ID, 3);
   SmallVector<uint64_t, 64> Record;
   writeMetadataStrings(VE.getMDStrings(), Record);
   writeMetadataRecords(VE.getNonMDStrings(), Record);
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 void ModuleBitcodeWriter::writeMetadataAttachment(const Function &F) {
-  stream().EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
+  Stream.EnterSubblock(bitc::METADATA_ATTACHMENT_ID, 3);
 
   SmallVector<uint64_t, 64> Record;
 
@@ -1683,7 +1680,7 @@
       Record.push_back(I.first);
       Record.push_back(VE.getMetadataID(I.second));
     }
-    stream().EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
+    Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
     Record.clear();
   }
 
@@ -1701,11 +1698,11 @@
         Record.push_back(MDs[i].first);
         Record.push_back(VE.getMetadataID(MDs[i].second));
       }
-      stream().EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
+      Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
       Record.clear();
     }
 
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 void ModuleBitcodeWriter::writeModuleMetadataStore() {
@@ -1714,22 +1711,22 @@
   // Write metadata kinds
   // METADATA_KIND - [n x [id, name]]
   SmallVector<StringRef, 8> Names;
-  M->getMDKindNames(Names);
+  M.getMDKindNames(Names);
 
   if (Names.empty()) return;
 
-  stream().EnterSubblock(bitc::METADATA_KIND_BLOCK_ID, 3);
+  Stream.EnterSubblock(bitc::METADATA_KIND_BLOCK_ID, 3);
 
   for (unsigned MDKindID = 0, e = Names.size(); MDKindID != e; ++MDKindID) {
     Record.push_back(MDKindID);
     StringRef KName = Names[MDKindID];
     Record.append(KName.begin(), KName.end());
 
-    stream().EmitRecord(bitc::METADATA_KIND, Record, 0);
+    Stream.EmitRecord(bitc::METADATA_KIND, Record, 0);
     Record.clear();
   }
 
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 void ModuleBitcodeWriter::writeOperandBundleTags() {
@@ -1740,23 +1737,23 @@
   // OPERAND_BUNDLE_TAG - [strchr x N]
 
   SmallVector<StringRef, 8> Tags;
-  M->getOperandBundleTags(Tags);
+  M.getOperandBundleTags(Tags);
 
   if (Tags.empty())
     return;
 
-  stream().EnterSubblock(bitc::OPERAND_BUNDLE_TAGS_BLOCK_ID, 3);
+  Stream.EnterSubblock(bitc::OPERAND_BUNDLE_TAGS_BLOCK_ID, 3);
 
   SmallVector<uint64_t, 64> Record;
 
   for (auto Tag : Tags) {
     Record.append(Tag.begin(), Tag.end());
 
-    stream().EmitRecord(bitc::OPERAND_BUNDLE_TAG, Record, 0);
+    Stream.EmitRecord(bitc::OPERAND_BUNDLE_TAG, Record, 0);
     Record.clear();
   }
 
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 static void emitSignedInt64(SmallVectorImpl<uint64_t> &Vals, uint64_t V) {
@@ -1770,7 +1767,7 @@
                                          bool isGlobal) {
   if (FirstVal == LastVal) return;
 
-  stream().EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4);
+  Stream.EnterSubblock(bitc::CONSTANTS_BLOCK_ID, 4);
 
   unsigned AggregateAbbrev = 0;
   unsigned String8Abbrev = 0;
@@ -1783,26 +1780,26 @@
     Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_AGGREGATE));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, Log2_32_Ceil(LastVal+1)));
-    AggregateAbbrev = stream().EmitAbbrev(Abbv);
+    AggregateAbbrev = Stream.EmitAbbrev(Abbv);
 
     // Abbrev for CST_CODE_STRING.
     Abbv = new BitCodeAbbrev();
     Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_STRING));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
-    String8Abbrev = stream().EmitAbbrev(Abbv);
+    String8Abbrev = Stream.EmitAbbrev(Abbv);
     // Abbrev for CST_CODE_CSTRING.
     Abbv = new BitCodeAbbrev();
     Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
-    CString7Abbrev = stream().EmitAbbrev(Abbv);
+    CString7Abbrev = Stream.EmitAbbrev(Abbv);
     // Abbrev for CST_CODE_CSTRING.
     Abbv = new BitCodeAbbrev();
     Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_CSTRING));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
-    CString6Abbrev = stream().EmitAbbrev(Abbv);
+    CString6Abbrev = Stream.EmitAbbrev(Abbv);
   }
 
   SmallVector<uint64_t, 64> Record;
@@ -1815,8 +1812,8 @@
     if (V->getType() != LastTy) {
       LastTy = V->getType();
       Record.push_back(VE.getTypeID(LastTy));
-      stream().EmitRecord(bitc::CST_CODE_SETTYPE, Record,
-                          CONSTANTS_SETTYPE_ABBREV);
+      Stream.EmitRecord(bitc::CST_CODE_SETTYPE, Record,
+                        CONSTANTS_SETTYPE_ABBREV);
       Record.clear();
     }
 
@@ -1834,7 +1831,7 @@
       const std::string &ConstraintStr = IA->getConstraintString();
       Record.push_back(ConstraintStr.size());
       Record.append(ConstraintStr.begin(), ConstraintStr.end());
-      stream().EmitRecord(bitc::CST_CODE_INLINEASM, Record);
+      Stream.EmitRecord(bitc::CST_CODE_INLINEASM, Record);
       Record.clear();
       continue;
     }
@@ -2014,11 +2011,11 @@
 #endif
       llvm_unreachable("Unknown constant!");
     }
-    stream().EmitRecord(Code, Record, AbbrevToUse);
+    Stream.EmitRecord(Code, Record, AbbrevToUse);
     Record.clear();
   }
 
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 void ModuleBitcodeWriter::writeModuleConstants() {
@@ -2066,7 +2063,7 @@
     for (auto &Input : Bundle.Inputs)
       pushValueAndType(Input, InstID, Record);
 
-    stream().EmitRecord(bitc::FUNC_CODE_OPERAND_BUNDLE, Record);
+    Stream.EmitRecord(bitc::FUNC_CODE_OPERAND_BUNDLE, Record);
     Record.clear();
   }
 }
@@ -2320,7 +2317,7 @@
       Vals64.push_back(VE.getValueID(PN.getIncomingBlock(i)));
     }
     // Emit a Vals64 vector and exit.
-    stream().EmitRecord(Code, Vals64, AbbrevToUse);
+    Stream.EmitRecord(Code, Vals64, AbbrevToUse);
     Vals64.clear();
     return;
   }
@@ -2468,7 +2465,7 @@
     break;
   }
 
-  stream().EmitRecord(Code, Vals, AbbrevToUse);
+  Stream.EmitRecord(Code, Vals, AbbrevToUse);
   Vals.clear();
 }
 
@@ -2489,15 +2486,15 @@
   if (IsModuleLevel && hasVSTOffsetPlaceholder()) {
     // Get the offset of the VST we are writing, and backpatch it into
     // the VST forward declaration record.
-    uint64_t VSTOffset = stream().GetCurrentBitNo();
+    uint64_t VSTOffset = Stream.GetCurrentBitNo();
     // The BitcodeStartBit was the stream offset of the actual bitcode
     // (e.g. excluding any initial darwin header).
     VSTOffset -= bitcodeStartBit();
     assert((VSTOffset & 31) == 0 && "VST block not 32-bit aligned");
-    stream().BackpatchWord(getVSTOffsetPlaceholder(), VSTOffset / 32);
+    Stream.BackpatchWord(VSTOffsetPlaceholder, VSTOffset / 32);
   }
 
-  stream().EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
+  Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
 
   // For the module-level VST, add abbrev Ids for the VST_CODE_FNENTRY
   // records, which are not used in the per-function VSTs.
@@ -2512,7 +2509,7 @@
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // funcoffset
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
-    FnEntry8BitAbbrev = stream().EmitAbbrev(Abbv);
+    FnEntry8BitAbbrev = Stream.EmitAbbrev(Abbv);
 
     // 7-bit fixed width VST_CODE_FNENTRY function strings.
     Abbv = new BitCodeAbbrev();
@@ -2521,7 +2518,7 @@
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // funcoffset
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
-    FnEntry7BitAbbrev = stream().EmitAbbrev(Abbv);
+    FnEntry7BitAbbrev = Stream.EmitAbbrev(Abbv);
 
     // 6-bit char6 VST_CODE_FNENTRY function strings.
     Abbv = new BitCodeAbbrev();
@@ -2530,7 +2527,7 @@
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // funcoffset
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
-    FnEntry6BitAbbrev = stream().EmitAbbrev(Abbv);
+    FnEntry6BitAbbrev = Stream.EmitAbbrev(Abbv);
   }
 
   // FIXME: Set up the abbrev, we know how many values there are!
@@ -2593,10 +2590,10 @@
       NameVals.push_back((unsigned char)P);
 
     // Emit the finished record.
-    stream().EmitRecord(Code, NameVals, AbbrevToUse);
+    Stream.EmitRecord(Code, NameVals, AbbrevToUse);
     NameVals.clear();
   }
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 /// Emit function names and summary offsets for the combined index
@@ -2605,28 +2602,28 @@
   assert(hasVSTOffsetPlaceholder() && "Expected non-zero VSTOffsetPlaceholder");
   // Get the offset of the VST we are writing, and backpatch it into
   // the VST forward declaration record.
-  uint64_t VSTOffset = stream().GetCurrentBitNo();
+  uint64_t VSTOffset = Stream.GetCurrentBitNo();
   assert((VSTOffset & 31) == 0 && "VST block not 32-bit aligned");
-  stream().BackpatchWord(getVSTOffsetPlaceholder(), VSTOffset / 32);
+  Stream.BackpatchWord(VSTOffsetPlaceholder, VSTOffset / 32);
 
-  stream().EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
+  Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 4);
 
   BitCodeAbbrev *Abbv = new BitCodeAbbrev();
   Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_COMBINED_GVDEFENTRY));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // sumoffset
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // guid
-  unsigned DefEntryAbbrev = stream().EmitAbbrev(Abbv);
+  unsigned DefEntryAbbrev = Stream.EmitAbbrev(Abbv);
 
   Abbv = new BitCodeAbbrev();
   Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_COMBINED_ENTRY));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // valueid
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // refguid
-  unsigned EntryAbbrev = stream().EmitAbbrev(Abbv);
+  unsigned EntryAbbrev = Stream.EmitAbbrev(Abbv);
 
   SmallVector<uint64_t, 64> NameVals;
 
-  for (const auto &FII : *Index) {
+  for (const auto &FII : Index) {
     GlobalValue::GUID FuncGUID = FII.first;
     unsigned ValueId = popValueId(FuncGUID);
 
@@ -2637,8 +2634,8 @@
       NameVals.push_back(FuncGUID);
 
       // Emit the finished record.
-      stream().EmitRecord(bitc::VST_CODE_COMBINED_GVDEFENTRY, NameVals,
-                          DefEntryAbbrev);
+      Stream.EmitRecord(bitc::VST_CODE_COMBINED_GVDEFENTRY, NameVals,
+                        DefEntryAbbrev);
       NameVals.clear();
     }
   }
@@ -2648,10 +2645,10 @@
     NameVals.push_back(GVI.first);
 
     // Emit the finished record.
-    stream().EmitRecord(bitc::VST_CODE_COMBINED_ENTRY, NameVals, EntryAbbrev);
+    Stream.EmitRecord(bitc::VST_CODE_COMBINED_ENTRY, NameVals, EntryAbbrev);
     NameVals.clear();
   }
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 void ModuleBitcodeWriter::writeUseList(UseListOrder &&Order) {
@@ -2664,7 +2661,7 @@
 
   SmallVector<uint64_t, 64> Record(Order.Shuffle.begin(), Order.Shuffle.end());
   Record.push_back(VE.getValueID(Order.V));
-  stream().EmitRecord(Code, Record);
+  Stream.EmitRecord(Code, Record);
 }
 
 void ModuleBitcodeWriter::writeUseListBlock(const Function *F) {
@@ -2678,12 +2675,12 @@
     // Nothing to do.
     return;
 
-  stream().EnterSubblock(bitc::USELIST_BLOCK_ID, 3);
+  Stream.EnterSubblock(bitc::USELIST_BLOCK_ID, 3);
   while (hasMore()) {
     writeUseList(std::move(VE.UseListOrders.back()));
     VE.UseListOrders.pop_back();
   }
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 /// Emit a function body to the module stream.
@@ -2692,9 +2689,9 @@
     DenseMap<const Function *, uint64_t> &FunctionToBitcodeIndex) {
   // Save the bitcode index of the start of this function block for recording
   // in the VST.
-  FunctionToBitcodeIndex[&F] = stream().GetCurrentBitNo();
+  FunctionToBitcodeIndex[&F] = Stream.GetCurrentBitNo();
 
-  stream().EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4);
+  Stream.EnterSubblock(bitc::FUNCTION_BLOCK_ID, 4);
   VE.incorporateFunction(F);
 
   SmallVector<unsigned, 64> Vals;
@@ -2702,7 +2699,7 @@
   // Emit the number of basic blocks, so the reader can create them ahead of
   // time.
   Vals.push_back(VE.getBasicBlocks().size());
-  stream().EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals);
+  Stream.EmitRecord(bitc::FUNC_CODE_DECLAREBLOCKS, Vals);
   Vals.clear();
 
   // If there are function-local constants, emit them now.
@@ -2738,7 +2735,7 @@
 
       if (DL == LastDL) {
         // Just repeat the same debug loc as last time.
-        stream().EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals);
+        Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC_AGAIN, Vals);
         continue;
       }
 
@@ -2746,7 +2743,7 @@
       Vals.push_back(DL->getColumn());
       Vals.push_back(VE.getMetadataOrNullID(DL->getScope()));
       Vals.push_back(VE.getMetadataOrNullID(DL->getInlinedAt()));
-      stream().EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals);
+      Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals);
       Vals.clear();
 
       LastDL = DL;
@@ -2760,7 +2757,7 @@
   if (VE.shouldPreserveUseListOrder())
     writeUseListBlock(&F);
   VE.purgeFunction();
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 // Emit blockinfo, which defines the standard abbreviations etc.
@@ -2768,7 +2765,7 @@
   // We only want to emit block info records for blocks that have multiple
   // instances: CONSTANTS_BLOCK, FUNCTION_BLOCK and VALUE_SYMTAB_BLOCK.
   // Other blocks can define their abbrevs inline.
-  stream().EnterBlockInfoBlock(2);
+  Stream.EnterBlockInfoBlock(2);
 
   { // 8-bit fixed-width VST_CODE_ENTRY/VST_CODE_BBENTRY strings.
     BitCodeAbbrev *Abbv = new BitCodeAbbrev();
@@ -2776,7 +2773,7 @@
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
-    if (stream().EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
+    if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
         VST_ENTRY_8_ABBREV)
       llvm_unreachable("Unexpected abbrev ordering!");
   }
@@ -2787,7 +2784,7 @@
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
-    if (stream().EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
+    if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
         VST_ENTRY_7_ABBREV)
       llvm_unreachable("Unexpected abbrev ordering!");
   }
@@ -2797,7 +2794,7 @@
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
-    if (stream().EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
+    if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
         VST_ENTRY_6_ABBREV)
       llvm_unreachable("Unexpected abbrev ordering!");
   }
@@ -2807,7 +2804,7 @@
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
-    if (stream().EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
+    if (Stream.EmitBlockInfoAbbrev(bitc::VALUE_SYMTAB_BLOCK_ID, Abbv) !=
         VST_BBENTRY_6_ABBREV)
       llvm_unreachable("Unexpected abbrev ordering!");
   }
@@ -2819,7 +2816,7 @@
     Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
                               VE.computeBitsRequiredForTypeIndicies()));
-    if (stream().EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
+    if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
         CONSTANTS_SETTYPE_ABBREV)
       llvm_unreachable("Unexpected abbrev ordering!");
   }
@@ -2828,7 +2825,7 @@
     BitCodeAbbrev *Abbv = new BitCodeAbbrev();
     Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_INTEGER));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-    if (stream().EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
+    if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
         CONSTANTS_INTEGER_ABBREV)
       llvm_unreachable("Unexpected abbrev ordering!");
   }
@@ -2841,14 +2838,14 @@
                               VE.computeBitsRequiredForTypeIndicies()));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));    // value id
 
-    if (stream().EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
+    if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
         CONSTANTS_CE_CAST_Abbrev)
       llvm_unreachable("Unexpected abbrev ordering!");
   }
   { // NULL abbrev for CONSTANTS_BLOCK.
     BitCodeAbbrev *Abbv = new BitCodeAbbrev();
     Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_NULL));
-    if (stream().EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
+    if (Stream.EmitBlockInfoAbbrev(bitc::CONSTANTS_BLOCK_ID, Abbv) !=
         CONSTANTS_NULL_Abbrev)
       llvm_unreachable("Unexpected abbrev ordering!");
   }
@@ -2863,7 +2860,7 @@
                               VE.computeBitsRequiredForTypeIndicies()));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
-    if (stream().EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
         FUNCTION_INST_LOAD_ABBREV)
       llvm_unreachable("Unexpected abbrev ordering!");
   }
@@ -2873,7 +2870,7 @@
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LHS
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
-    if (stream().EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
         FUNCTION_INST_BINOP_ABBREV)
       llvm_unreachable("Unexpected abbrev ordering!");
   }
@@ -2884,7 +2881,7 @@
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // RHS
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // opc
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7)); // flags
-    if (stream().EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
         FUNCTION_INST_BINOP_FLAGS_ABBREV)
       llvm_unreachable("Unexpected abbrev ordering!");
   }
@@ -2895,7 +2892,7 @@
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,       // dest ty
                               VE.computeBitsRequiredForTypeIndicies()));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4));  // opc
-    if (stream().EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
         FUNCTION_INST_CAST_ABBREV)
       llvm_unreachable("Unexpected abbrev ordering!");
   }
@@ -2903,7 +2900,7 @@
   { // INST_RET abbrev for FUNCTION_BLOCK.
     BitCodeAbbrev *Abbv = new BitCodeAbbrev();
     Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
-    if (stream().EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
         FUNCTION_INST_RET_VOID_ABBREV)
       llvm_unreachable("Unexpected abbrev ordering!");
   }
@@ -2911,14 +2908,14 @@
     BitCodeAbbrev *Abbv = new BitCodeAbbrev();
     Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_RET));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ValID
-    if (stream().EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
         FUNCTION_INST_RET_VAL_ABBREV)
       llvm_unreachable("Unexpected abbrev ordering!");
   }
   { // INST_UNREACHABLE abbrev for FUNCTION_BLOCK.
     BitCodeAbbrev *Abbv = new BitCodeAbbrev();
     Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_UNREACHABLE));
-    if (stream().EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
         FUNCTION_INST_UNREACHABLE_ABBREV)
       llvm_unreachable("Unexpected abbrev ordering!");
   }
@@ -2930,18 +2927,18 @@
                               Log2_32_Ceil(VE.getTypes().size() + 1)));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
-    if (stream().EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
+    if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID, Abbv) !=
         FUNCTION_INST_GEP_ABBREV)
       llvm_unreachable("Unexpected abbrev ordering!");
   }
 
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 /// Write the module path strings, currently only used when generating
 /// a combined index file.
 void IndexBitcodeWriter::writeModStrings() {
-  stream().EnterSubblock(bitc::MODULE_STRTAB_BLOCK_ID, 3);
+  Stream.EnterSubblock(bitc::MODULE_STRTAB_BLOCK_ID, 3);
 
   // TODO: See which abbrev sizes we actually need to emit
 
@@ -2951,7 +2948,7 @@
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
-  unsigned Abbrev8Bit = stream().EmitAbbrev(Abbv);
+  unsigned Abbrev8Bit = Stream.EmitAbbrev(Abbv);
 
   // 7-bit fixed width MST_ENTRY strings.
   Abbv = new BitCodeAbbrev();
@@ -2959,7 +2956,7 @@
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
-  unsigned Abbrev7Bit = stream().EmitAbbrev(Abbv);
+  unsigned Abbrev7Bit = Stream.EmitAbbrev(Abbv);
 
   // 6-bit char6 MST_ENTRY strings.
   Abbv = new BitCodeAbbrev();
@@ -2967,7 +2964,7 @@
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
-  unsigned Abbrev6Bit = stream().EmitAbbrev(Abbv);
+  unsigned Abbrev6Bit = Stream.EmitAbbrev(Abbv);
 
   // Module Hash, 160 bits SHA1. Optionally, emitted after each MST_CODE_ENTRY.
   Abbv = new BitCodeAbbrev();
@@ -2977,10 +2974,10 @@
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
-  unsigned AbbrevHash = stream().EmitAbbrev(Abbv);
+  unsigned AbbrevHash = Stream.EmitAbbrev(Abbv);
 
   SmallVector<unsigned, 64> Vals;
-  for (const auto &MPSE : Index->modulePaths()) {
+  for (const auto &MPSE : Index.modulePaths()) {
     StringEncoding Bits =
         getStringEncoding(MPSE.getKey().data(), MPSE.getKey().size());
     unsigned AbbrevToUse = Abbrev8Bit;
@@ -2995,7 +2992,7 @@
       Vals.push_back((unsigned char)P);
 
     // Emit the finished record.
-    stream().EmitRecord(bitc::MST_CODE_ENTRY, Vals, AbbrevToUse);
+    Stream.EmitRecord(bitc::MST_CODE_ENTRY, Vals, AbbrevToUse);
 
     Vals.clear();
     // Emit an optional hash for the module now
@@ -3008,12 +3005,12 @@
     }
     if (!AllZero) {
       // Emit the hash record.
-      stream().EmitRecord(bitc::MST_CODE_HASH, Vals, AbbrevHash);
+      Stream.EmitRecord(bitc::MST_CODE_HASH, Vals, AbbrevHash);
     }
 
     Vals.clear();
   }
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 // Helper to emit a single function summary record.
@@ -3045,7 +3042,7 @@
       (HasProfileData ? bitc::FS_PERMODULE_PROFILE : bitc::FS_PERMODULE);
 
   // Emit the finished record.
-  stream().EmitRecord(Code, NameVals, FSAbbrev);
+  Stream.EmitRecord(Code, NameVals, FSAbbrev);
   NameVals.clear();
 }
 
@@ -3063,21 +3060,21 @@
   GlobalVarSummary *VS = cast<GlobalVarSummary>(Info->summary());
   for (auto Ref : VS->refs())
     NameVals.push_back(VE.getValueID(Ref.getValue()));
-  stream().EmitRecord(bitc::FS_PERMODULE_GLOBALVAR_INIT_REFS, NameVals,
-                      FSModRefsAbbrev);
+  Stream.EmitRecord(bitc::FS_PERMODULE_GLOBALVAR_INIT_REFS, NameVals,
+                    FSModRefsAbbrev);
   NameVals.clear();
 }
 
 /// Emit the per-module summary section alongside the rest of
 /// the module's bitcode.
 void ModuleBitcodeWriter::writePerModuleGlobalValueSummary() {
-  if (M->empty())
+  if (M.empty())
     return;
 
   if (Index->begin() == Index->end())
     return;
 
-  stream().EnterSubblock(bitc::GLOBALVAL_SUMMARY_BLOCK_ID, 3);
+  Stream.EnterSubblock(bitc::GLOBALVAL_SUMMARY_BLOCK_ID, 3);
 
   // Abbrev for FS_PERMODULE.
   BitCodeAbbrev *Abbv = new BitCodeAbbrev();
@@ -3089,7 +3086,7 @@
   // numrefs x valueid, n x (valueid, callsitecount)
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  unsigned FSCallsAbbrev = stream().EmitAbbrev(Abbv);
+  unsigned FSCallsAbbrev = Stream.EmitAbbrev(Abbv);
 
   // Abbrev for FS_PERMODULE_PROFILE.
   Abbv = new BitCodeAbbrev();
@@ -3101,7 +3098,7 @@
   // numrefs x valueid, n x (valueid, callsitecount, profilecount)
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  unsigned FSCallsProfileAbbrev = stream().EmitAbbrev(Abbv);
+  unsigned FSCallsProfileAbbrev = Stream.EmitAbbrev(Abbv);
 
   // Abbrev for FS_PERMODULE_GLOBALVAR_INIT_REFS.
   Abbv = new BitCodeAbbrev();
@@ -3110,7 +3107,7 @@
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 5)); // linkage
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));  // valueids
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  unsigned FSModRefsAbbrev = stream().EmitAbbrev(Abbv);
+  unsigned FSModRefsAbbrev = Stream.EmitAbbrev(Abbv);
 
   // Abbrev for FS_ALIAS.
   Abbv = new BitCodeAbbrev();
@@ -3118,12 +3115,12 @@
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 5)); // linkage
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // valueid
-  unsigned FSAliasAbbrev = stream().EmitAbbrev(Abbv);
+  unsigned FSAliasAbbrev = Stream.EmitAbbrev(Abbv);
 
   SmallVector<uint64_t, 64> NameVals;
   // Iterate over the list of functions instead of the Index to
   // ensure the ordering is stable.
-  for (const Function &F : *M) {
+  for (const Function &F : M) {
     if (F.isDeclaration())
       continue;
     // Summary emission does not support anonymous functions, they have to
@@ -3134,16 +3131,16 @@
     auto *Info = Index->getGlobalValueInfo(F);
     writePerModuleFunctionSummaryRecord(
         NameVals, Info,
-        VE.getValueID(M->getValueSymbolTable().lookup(F.getName())),
+        VE.getValueID(M.getValueSymbolTable().lookup(F.getName())),
         FSCallsAbbrev, FSCallsProfileAbbrev, F);
   }
 
   // Capture references from GlobalVariable initializers, which are outside
   // of a function scope.
-  for (const GlobalVariable &G : M->globals())
+  for (const GlobalVariable &G : M.globals())
     writeModuleLevelReferences(G, NameVals, FSModRefsAbbrev);
 
-  for (const GlobalAlias &A : M->aliases()) {
+  for (const GlobalAlias &A : M.aliases()) {
     auto *Aliasee = A.getBaseObject();
     if (!Aliasee->hasName())
       // Nameless function don't have an entry in the summary, skip it.
@@ -3153,16 +3150,16 @@
     NameVals.push_back(AliasId);
     NameVals.push_back(getEncodedLinkage(A.getLinkage()));
     NameVals.push_back(AliaseeId);
-    stream().EmitRecord(bitc::FS_ALIAS, NameVals, FSAliasAbbrev);
+    Stream.EmitRecord(bitc::FS_ALIAS, NameVals, FSAliasAbbrev);
     NameVals.clear();
   }
 
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 /// Emit the combined summary section into the combined index file.
 void IndexBitcodeWriter::writeCombinedGlobalValueSummary() {
-  stream().EnterSubblock(bitc::GLOBALVAL_SUMMARY_BLOCK_ID, 3);
+  Stream.EnterSubblock(bitc::GLOBALVAL_SUMMARY_BLOCK_ID, 3);
 
   // Abbrev for FS_COMBINED.
   BitCodeAbbrev *Abbv = new BitCodeAbbrev();
@@ -3174,7 +3171,7 @@
   // numrefs x valueid, n x (valueid, callsitecount)
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  unsigned FSCallsAbbrev = stream().EmitAbbrev(Abbv);
+  unsigned FSCallsAbbrev = Stream.EmitAbbrev(Abbv);
 
   // Abbrev for FS_COMBINED_PROFILE.
   Abbv = new BitCodeAbbrev();
@@ -3186,7 +3183,7 @@
   // numrefs x valueid, n x (valueid, callsitecount, profilecount)
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  unsigned FSCallsProfileAbbrev = stream().EmitAbbrev(Abbv);
+  unsigned FSCallsProfileAbbrev = Stream.EmitAbbrev(Abbv);
 
   // Abbrev for FS_COMBINED_GLOBALVAR_INIT_REFS.
   Abbv = new BitCodeAbbrev();
@@ -3195,7 +3192,7 @@
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 5)); // linkage
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));    // valueids
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
-  unsigned FSModRefsAbbrev = stream().EmitAbbrev(Abbv);
+  unsigned FSModRefsAbbrev = Stream.EmitAbbrev(Abbv);
 
   // Abbrev for FS_COMBINED_ALIAS.
   Abbv = new BitCodeAbbrev();
@@ -3203,7 +3200,7 @@
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // modid
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 5)); // linkage
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));   // offset
-  unsigned FSAliasAbbrev = stream().EmitAbbrev(Abbv);
+  unsigned FSAliasAbbrev = Stream.EmitAbbrev(Abbv);
 
   // The aliases are emitted as a post-pass, and will point to the summary
   // offset id of the aliasee. For this purpose we need to be able to get back
@@ -3212,7 +3209,7 @@
   DenseMap<const GlobalValueSummary *, uint64_t> SummaryToOffsetMap;
 
   SmallVector<uint64_t, 64> NameVals;
-  for (const auto &FII : *Index) {
+  for (const auto &FII : Index) {
     for (auto &FI : FII.second) {
       GlobalValueSummary *S = FI->summary();
       assert(S);
@@ -3224,7 +3221,7 @@
       }
 
       if (auto *VS = dyn_cast<GlobalVarSummary>(S)) {
-        NameVals.push_back(Index->getModuleId(VS->modulePath()));
+        NameVals.push_back(Index.getModuleId(VS->modulePath()));
         NameVals.push_back(getEncodedLinkage(VS->linkage()));
         for (auto &RI : VS->refs()) {
           NameVals.push_back(getValueId(RI.getGUID()));
@@ -3233,20 +3230,20 @@
         // Record the starting offset of this summary entry for use
         // in the VST entry. Add the current code size since the
         // reader will invoke readRecord after the abbrev id read.
-        FI->setBitcodeIndex(stream().GetCurrentBitNo() +
-                            stream().GetAbbrevIDWidth());
+        FI->setBitcodeIndex(Stream.GetCurrentBitNo() +
+                            Stream.GetAbbrevIDWidth());
         // Store temporarily the offset in the map for a possible alias.
         SummaryToOffsetMap[S] = FI->bitcodeIndex();
 
         // Emit the finished record.
-        stream().EmitRecord(bitc::FS_COMBINED_GLOBALVAR_INIT_REFS, NameVals,
-                            FSModRefsAbbrev);
+        Stream.EmitRecord(bitc::FS_COMBINED_GLOBALVAR_INIT_REFS, NameVals,
+                          FSModRefsAbbrev);
         NameVals.clear();
         continue;
       }
 
       auto *FS = cast<FunctionSummary>(S);
-      NameVals.push_back(Index->getModuleId(FS->modulePath()));
+      NameVals.push_back(Index.getModuleId(FS->modulePath()));
       NameVals.push_back(getEncodedLinkage(FS->linkage()));
       NameVals.push_back(FS->instCount());
       NameVals.push_back(FS->refs().size());
@@ -3277,8 +3274,7 @@
       // Record the starting offset of this summary entry for use
       // in the VST entry. Add the current code size since the
       // reader will invoke readRecord after the abbrev id read.
-      FI->setBitcodeIndex(stream().GetCurrentBitNo() +
-                          stream().GetAbbrevIDWidth());
+      FI->setBitcodeIndex(Stream.GetCurrentBitNo() + Stream.GetAbbrevIDWidth());
       // Store temporarily the offset in the map for a possible alias.
       SummaryToOffsetMap[S] = FI->bitcodeIndex();
 
@@ -3288,14 +3284,14 @@
           (HasProfileData ? bitc::FS_COMBINED_PROFILE : bitc::FS_COMBINED);
 
       // Emit the finished record.
-      stream().EmitRecord(Code, NameVals, FSAbbrev);
+      Stream.EmitRecord(Code, NameVals, FSAbbrev);
       NameVals.clear();
     }
   }
 
   for (auto GVI : Aliases) {
     AliasSummary *AS = cast<AliasSummary>(GVI->summary());
-    NameVals.push_back(Index->getModuleId(AS->modulePath()));
+    NameVals.push_back(Index.getModuleId(AS->modulePath()));
     NameVals.push_back(getEncodedLinkage(AS->linkage()));
     auto AliaseeOffset = SummaryToOffsetMap[&AS->getAliasee()];
     assert(AliaseeOffset);
@@ -3304,26 +3300,25 @@
     // Record the starting offset of this summary entry for use
     // in the VST entry. Add the current code size since the
     // reader will invoke readRecord after the abbrev id read.
-    GVI->setBitcodeIndex(stream().GetCurrentBitNo() +
-                         stream().GetAbbrevIDWidth());
+    GVI->setBitcodeIndex(Stream.GetCurrentBitNo() + Stream.GetAbbrevIDWidth());
 
     // Emit the finished record.
-    stream().EmitRecord(bitc::FS_COMBINED_ALIAS, NameVals, FSAliasAbbrev);
+    Stream.EmitRecord(bitc::FS_COMBINED_ALIAS, NameVals, FSAliasAbbrev);
     NameVals.clear();
   }
 
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 void ModuleBitcodeWriter::writeIdentificationBlock() {
-  stream().EnterSubblock(bitc::IDENTIFICATION_BLOCK_ID, 5);
+  Stream.EnterSubblock(bitc::IDENTIFICATION_BLOCK_ID, 5);
 
   // Write the "user readable" string identifying the bitcode producer
   BitCodeAbbrev *Abbv = new BitCodeAbbrev();
   Abbv->Add(BitCodeAbbrevOp(bitc::IDENTIFICATION_CODE_STRING));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
-  auto StringAbbrev = stream().EmitAbbrev(Abbv);
+  auto StringAbbrev = Stream.EmitAbbrev(Abbv);
   writeStringRecord(bitc::IDENTIFICATION_CODE_STRING,
                     "LLVM" LLVM_VERSION_STRING, StringAbbrev);
 
@@ -3331,18 +3326,18 @@
   Abbv = new BitCodeAbbrev();
   Abbv->Add(BitCodeAbbrevOp(bitc::IDENTIFICATION_CODE_EPOCH));
   Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
-  auto EpochAbbrev = stream().EmitAbbrev(Abbv);
+  auto EpochAbbrev = Stream.EmitAbbrev(Abbv);
   SmallVector<unsigned, 1> Vals = {bitc::BITCODE_CURRENT_EPOCH};
-  stream().EmitRecord(bitc::IDENTIFICATION_CODE_EPOCH, Vals, EpochAbbrev);
-  stream().ExitBlock();
+  Stream.EmitRecord(bitc::IDENTIFICATION_CODE_EPOCH, Vals, EpochAbbrev);
+  Stream.ExitBlock();
 }
 
 void ModuleBitcodeWriter::writeModuleHash(size_t BlockStartPos) {
   // Emit the module's hash.
   // MODULE_CODE_HASH: [5*i32]
   SHA1 Hasher;
-  Hasher.update(ArrayRef<uint8_t>((uint8_t *)&(buffer())[BlockStartPos],
-                                  buffer().size() - BlockStartPos));
+  Hasher.update(ArrayRef<uint8_t>((uint8_t *)&(Buffer)[BlockStartPos],
+                                  Buffer.size() - BlockStartPos));
   auto Hash = Hasher.result();
   SmallVector<uint64_t, 20> Vals;
   auto LShift = [&](unsigned char Val, unsigned Amount)
@@ -3355,7 +3350,7 @@
   }
 
   // Emit the finished record.
-  stream().EmitRecord(bitc::MODULE_CODE_HASH, Vals);
+  Stream.EmitRecord(bitc::MODULE_CODE_HASH, Vals);
 }
 
 void BitcodeWriter::write() {
@@ -3376,13 +3371,13 @@
 }
 
 void ModuleBitcodeWriter::writeModule() {
-  stream().EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
-  size_t BlockStartPos = buffer().size();
+  Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
+  size_t BlockStartPos = Buffer.size();
 
   SmallVector<unsigned, 1> Vals;
   unsigned CurVersion = 1;
   Vals.push_back(CurVersion);
-  stream().EmitRecord(bitc::MODULE_CODE_VERSION, Vals);
+  Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals);
 
   // Emit blockinfo, which defines the standard abbreviations etc.
   writeBlockInfo();
@@ -3419,7 +3414,7 @@
 
   // Emit function bodies.
   DenseMap<const Function *, uint64_t> FunctionToBitcodeIndex;
-  for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F)
+  for (Module::const_iterator F = M.begin(), E = M.end(); F != E; ++F)
     if (!F->isDeclaration())
       writeFunction(*F, FunctionToBitcodeIndex);
 
@@ -3428,14 +3423,14 @@
   if (Index)
     writePerModuleGlobalValueSummary();
 
-  writeValueSymbolTable(M->getValueSymbolTable(),
+  writeValueSymbolTable(M.getValueSymbolTable(),
                         /* IsModuleLevel */ true, &FunctionToBitcodeIndex);
 
   if (GenerateHash) {
     writeModuleHash(BlockStartPos);
   }
 
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 static void writeInt32ToBuffer(uint32_t Value, SmallVectorImpl<char> &Buffer,
@@ -3506,12 +3501,12 @@
 /// Helper to write the header common to all bitcode files.
 void BitcodeWriter::writeBitcodeHeader() {
   // Emit the file header.
-  stream().Emit((unsigned)'B', 8);
-  stream().Emit((unsigned)'C', 8);
-  stream().Emit(0x0, 4);
-  stream().Emit(0xC, 4);
-  stream().Emit(0xE, 4);
-  stream().Emit(0xD, 4);
+  Stream.Emit((unsigned)'B', 8);
+  Stream.Emit((unsigned)'C', 8);
+  Stream.Emit(0x0, 4);
+  Stream.Emit(0xC, 4);
+  Stream.Emit(0xE, 4);
+  Stream.Emit(0xD, 4);
 }
 
 /// WriteBitcodeToFile - Write the specified module to the specified output
@@ -3530,8 +3525,8 @@
     Buffer.insert(Buffer.begin(), BWH_HeaderSize, 0);
 
   // Emit the module into the buffer.
-  ModuleBitcodeWriter ModuleWriter(M, &Buffer, ShouldPreserveUseListOrder,
-                                   Index, GenerateHash);
+  ModuleBitcodeWriter ModuleWriter(M, Buffer, ShouldPreserveUseListOrder, Index,
+                                   GenerateHash);
   ModuleWriter.write();
 
   if (TT.isOSDarwin() || TT.isOSBinFormatMachO())
@@ -3542,12 +3537,12 @@
 }
 
 void IndexBitcodeWriter::writeIndex() {
-  stream().EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
+  Stream.EnterSubblock(bitc::MODULE_BLOCK_ID, 3);
 
   SmallVector<unsigned, 1> Vals;
   unsigned CurVersion = 1;
   Vals.push_back(CurVersion);
-  stream().EmitRecord(bitc::MODULE_CODE_VERSION, Vals);
+  Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals);
 
   // If we have a VST, write the VSTOFFSET record placeholder.
   writeValueSymbolTableForwardDecl();
@@ -3562,7 +3557,7 @@
   // real VST and real values when this is invoked).
   writeCombinedValueSymbolTable();
 
-  stream().ExitBlock();
+  Stream.ExitBlock();
 }
 
 // Write the specified module summary index to the given raw output stream,
@@ -3572,7 +3567,7 @@
   SmallVector<char, 0> Buffer;
   Buffer.reserve(256 * 1024);
 
-  IndexBitcodeWriter IndexWriter(&Buffer, &Index);
+  IndexBitcodeWriter IndexWriter(Buffer, Index);
   IndexWriter.write();
 
   Out.write((char *)&Buffer.front(), Buffer.size());