Include llvm::Optional in clang/Basic/LLVM.h

Post-commit CR feedback from Jordan Rose regarding r175594.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@175679 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Serialization/ASTReader.cpp b/lib/Serialization/ASTReader.cpp
index f8e1c3e..6dff373 100644
--- a/lib/Serialization/ASTReader.cpp
+++ b/lib/Serialization/ASTReader.cpp
@@ -4045,7 +4045,7 @@
 
 /// \brief Optionally returns true or false if the preallocated preprocessed
 /// entity with index \arg Index came from file \arg FID.
-llvm::Optional<bool> ASTReader::isPreprocessedEntityInFileID(unsigned Index,
+Optional<bool> ASTReader::isPreprocessedEntityInFileID(unsigned Index,
                                                              FileID FID) {
   if (FID.isInvalid())
     return false;
@@ -4071,7 +4071,7 @@
     ASTReader &Reader;
     const FileEntry *FE;
     
-    llvm::Optional<HeaderFileInfo> HFI;
+    Optional<HeaderFileInfo> HFI;
     
   public:
     HeaderFileInfoVisitor(ASTReader &Reader, const FileEntry *FE)
@@ -4101,14 +4101,14 @@
       return true;
     }
     
-    llvm::Optional<HeaderFileInfo> getHeaderFileInfo() const { return HFI; }
+    Optional<HeaderFileInfo> getHeaderFileInfo() const { return HFI; }
   };
 }
 
 HeaderFileInfo ASTReader::GetHeaderFileInfo(const FileEntry *FE) {
   HeaderFileInfoVisitor Visitor(*this, FE);
   ModuleMgr.visit(&HeaderFileInfoVisitor::visit, &Visitor);
-  if (llvm::Optional<HeaderFileInfo> HFI = Visitor.getHeaderFileInfo()) {
+  if (Optional<HeaderFileInfo> HFI = Visitor.getHeaderFileInfo()) {
     if (Listener)
       Listener->ReadHeaderFileInfo(*HFI, FE->getUID());
     return *HFI;
@@ -4468,7 +4468,7 @@
     QualType Pattern = readType(*Loc.F, Record, Idx);
     if (Pattern.isNull())
       return QualType();
-    llvm::Optional<unsigned> NumExpansions;
+    Optional<unsigned> NumExpansions;
     if (Record[1])
       NumExpansions = Record[1] - 1;
     return Context.getPackExpansionType(Pattern, NumExpansions);
@@ -6542,7 +6542,7 @@
     return TemplateArgument(ReadTemplateName(F, Record, Idx));
   case TemplateArgument::TemplateExpansion: {
     TemplateName Name = ReadTemplateName(F, Record, Idx);
-    llvm::Optional<unsigned> NumTemplateExpansions;
+    Optional<unsigned> NumTemplateExpansions;
     if (unsigned NumExpansions = Record[Idx++])
       NumTemplateExpansions = NumExpansions - 1;
     return TemplateArgument(Name, NumTemplateExpansions);
diff --git a/lib/Serialization/ASTWriter.cpp b/lib/Serialization/ASTWriter.cpp
index f33fbc2..09c5bbb 100644
--- a/lib/Serialization/ASTWriter.cpp
+++ b/lib/Serialization/ASTWriter.cpp
@@ -353,7 +353,7 @@
 
 void ASTTypeWriter::VisitPackExpansionType(const PackExpansionType *T) {
   Writer.AddTypeRef(T->getPattern(), Record);
-  if (llvm::Optional<unsigned> NumExpansions = T->getNumExpansions())
+  if (Optional<unsigned> NumExpansions = T->getNumExpansions())
     Record.push_back(*NumExpansions + 1);
   else
     Record.push_back(0);
@@ -3301,11 +3301,11 @@
 void ASTWriter::AddVersionTuple(const VersionTuple &Version,
                                 RecordDataImpl &Record) {
   Record.push_back(Version.getMajor());
-  if (llvm::Optional<unsigned> Minor = Version.getMinor())
+  if (Optional<unsigned> Minor = Version.getMinor())
     Record.push_back(*Minor + 1);
   else
     Record.push_back(0);
-  if (llvm::Optional<unsigned> Subminor = Version.getSubminor())
+  if (Optional<unsigned> Subminor = Version.getSubminor())
     Record.push_back(*Subminor + 1);
   else
     Record.push_back(0);
@@ -4463,7 +4463,7 @@
     break;
   case TemplateArgument::TemplateExpansion:
     AddTemplateName(Arg.getAsTemplateOrTemplatePattern(), Record);
-    if (llvm::Optional<unsigned> NumExpansions = Arg.getNumTemplateExpansions())
+    if (Optional<unsigned> NumExpansions = Arg.getNumTemplateExpansions())
       Record.push_back(*NumExpansions + 1);
     else
       Record.push_back(0);