diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 7f114c0..f0e9bbd 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -1470,6 +1470,7 @@
 
   ModuleFile *F = GlobalSLocEntryMap.find(-ID)->second;
   if (llvm::Error Err = F->SLocEntryCursor.JumpToBit(
+          F->SLocEntryOffsetsBase +
           F->SLocEntryOffsets[ID - F->SLocEntryBaseID])) {
     Error(std::move(Err));
     return true;
@@ -1932,9 +1933,8 @@
   return HFI;
 }
 
-void ASTReader::addPendingMacro(IdentifierInfo *II,
-                                ModuleFile *M,
-                                uint64_t MacroDirectivesOffset) {
+void ASTReader::addPendingMacro(IdentifierInfo *II, ModuleFile *M,
+                                uint32_t MacroDirectivesOffset) {
   assert(NumCurrentElementsDeserializing > 0 &&"Missing deserialization guard");
   PendingMacroIDs[II].push_back(PendingMacroInfo(M, MacroDirectivesOffset));
 }
@@ -2099,7 +2099,8 @@
 
   BitstreamCursor &Cursor = M.MacroCursor;
   SavedStreamPosition SavedPosition(Cursor);
-  if (llvm::Error Err = Cursor.JumpToBit(PMInfo.MacroDirectivesOffset)) {
+  if (llvm::Error Err =
+          Cursor.JumpToBit(M.MacroOffsetsBase + PMInfo.MacroDirectivesOffset)) {
     Error(std::move(Err));
     return;
   }
@@ -3098,7 +3099,7 @@
         Error("duplicate TYPE_OFFSET record in AST file");
         return Failure;
       }
-      F.TypeOffsets = (const uint32_t *)Blob.data();
+      F.TypeOffsets = reinterpret_cast<const UnderalignedInt64 *>(Blob.data());
       F.LocalNumTypes = Record[0];
       unsigned LocalBaseTypeIndex = Record[1];
       F.BaseTypeIndex = getTotalNumTypes();
@@ -3376,6 +3377,7 @@
       F.SLocEntryOffsets = (const uint32_t *)Blob.data();
       F.LocalNumSLocEntries = Record[0];
       unsigned SLocSpaceSize = Record[1];
+      F.SLocEntryOffsetsBase = Record[2];
       std::tie(F.SLocEntryBaseID, F.SLocEntryBaseOffset) =
           SourceMgr.AllocateLoadedSLocEntries(F.LocalNumSLocEntries,
                                               SLocSpaceSize);
@@ -3694,6 +3696,7 @@
       F.MacroOffsets = (const uint32_t *)Blob.data();
       F.LocalNumMacros = Record[0];
       unsigned LocalBaseMacroID = Record[1];
+      F.MacroOffsetsBase = Record[2];
       F.BaseMacroID = getTotalNumMacros();
 
       if (F.LocalNumMacros > 0) {
@@ -5907,8 +5910,8 @@
   }
 
   SavedStreamPosition SavedPosition(M.PreprocessorDetailCursor);
-  if (llvm::Error Err =
-          M.PreprocessorDetailCursor.JumpToBit(PPOffs.BitOffset)) {
+  if (llvm::Error Err = M.PreprocessorDetailCursor.JumpToBit(
+          M.MacroOffsetsBase + PPOffs.BitOffset)) {
     Error(std::move(Err));
     return nullptr;
   }
@@ -6321,7 +6324,8 @@
   GlobalTypeMapType::iterator I = GlobalTypeMap.find(Index);
   assert(I != GlobalTypeMap.end() && "Corrupted global type map");
   ModuleFile *M = I->second;
-  return RecordLocation(M, M->TypeOffsets[Index - M->BaseTypeIndex]);
+  return RecordLocation(
+      M, M->TypeOffsets[Index - M->BaseTypeIndex].getBitOffset());
 }
 
 static llvm::Optional<Type::TypeClass> getTypeClassForCode(TypeCode code) {
@@ -8427,7 +8431,8 @@
     assert(I != GlobalMacroMap.end() && "Corrupted global macro map");
     ModuleFile *M = I->second;
     unsigned Index = ID - M->BaseMacroID;
-    MacrosLoaded[ID] = ReadMacroRecord(*M, M->MacroOffsets[Index]);
+    MacrosLoaded[ID] =
+        ReadMacroRecord(*M, M->MacroOffsetsBase + M->MacroOffsets[Index]);
 
     if (DeserializationListener)
       DeserializationListener->MacroRead(ID + NUM_PREDEF_MACRO_IDS,