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/AST/NSAPI.cpp b/lib/AST/NSAPI.cpp
index 4c20235..b06769e 100644
--- a/lib/AST/NSAPI.cpp
+++ b/lib/AST/NSAPI.cpp
@@ -67,7 +67,7 @@
   return NSStringSelectors[MK];
 }
 
-llvm::Optional<NSAPI::NSStringMethodKind>
+Optional<NSAPI::NSStringMethodKind>
 NSAPI::getNSStringMethodKind(Selector Sel) const {
   for (unsigned i = 0; i != NumNSStringMethods; ++i) {
     NSStringMethodKind MK = NSStringMethodKind(i);
@@ -75,7 +75,7 @@
       return MK;
   }
 
-  return llvm::Optional<NSStringMethodKind>();
+  return Optional<NSStringMethodKind>();
 }
 
 Selector NSAPI::getNSArraySelector(NSArrayMethodKind MK) const {
@@ -126,15 +126,14 @@
   return NSArraySelectors[MK];
 }
 
-llvm::Optional<NSAPI::NSArrayMethodKind>
-NSAPI::getNSArrayMethodKind(Selector Sel) {
+Optional<NSAPI::NSArrayMethodKind> NSAPI::getNSArrayMethodKind(Selector Sel) {
   for (unsigned i = 0; i != NumNSArrayMethods; ++i) {
     NSArrayMethodKind MK = NSArrayMethodKind(i);
     if (Sel == getNSArraySelector(MK))
       return MK;
   }
 
-  return llvm::Optional<NSArrayMethodKind>();
+  return Optional<NSArrayMethodKind>();
 }
 
 Selector NSAPI::getNSDictionarySelector(
@@ -212,7 +211,7 @@
   return NSDictionarySelectors[MK];
 }
 
-llvm::Optional<NSAPI::NSDictionaryMethodKind>
+Optional<NSAPI::NSDictionaryMethodKind>
 NSAPI::getNSDictionaryMethodKind(Selector Sel) {
   for (unsigned i = 0; i != NumNSDictionaryMethods; ++i) {
     NSDictionaryMethodKind MK = NSDictionaryMethodKind(i);
@@ -220,7 +219,7 @@
       return MK;
   }
 
-  return llvm::Optional<NSDictionaryMethodKind>();
+  return Optional<NSDictionaryMethodKind>();
 }
 
 Selector NSAPI::getNSNumberLiteralSelector(NSNumberLiteralMethodKind MK,
@@ -275,7 +274,7 @@
   return Sels[MK];
 }
 
-llvm::Optional<NSAPI::NSNumberLiteralMethodKind>
+Optional<NSAPI::NSNumberLiteralMethodKind>
 NSAPI::getNSNumberLiteralMethodKind(Selector Sel) const {
   for (unsigned i = 0; i != NumNSNumberLiteralMethods; ++i) {
     NSNumberLiteralMethodKind MK = NSNumberLiteralMethodKind(i);
@@ -283,14 +282,14 @@
       return MK;
   }
 
-  return llvm::Optional<NSNumberLiteralMethodKind>();
+  return Optional<NSNumberLiteralMethodKind>();
 }
 
-llvm::Optional<NSAPI::NSNumberLiteralMethodKind>
+Optional<NSAPI::NSNumberLiteralMethodKind>
 NSAPI::getNSNumberFactoryMethodKind(QualType T) const {
   const BuiltinType *BT = T->getAs<BuiltinType>();
   if (!BT)
-    return llvm::Optional<NSAPI::NSNumberLiteralMethodKind>();
+    return Optional<NSAPI::NSNumberLiteralMethodKind>();
 
   const TypedefType *TDT = T->getAs<TypedefType>();
   if (TDT) {
@@ -364,7 +363,7 @@
     break;
   }
   
-  return llvm::Optional<NSAPI::NSNumberLiteralMethodKind>();
+  return Optional<NSAPI::NSNumberLiteralMethodKind>();
 }
 
 /// \brief Returns true if \param T is a typedef of "BOOL" in objective-c.