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/StaticAnalyzer/Checkers/GenericTaintChecker.cpp b/lib/StaticAnalyzer/Checkers/GenericTaintChecker.cpp
index 00ef1f6..c67c597 100644
--- a/lib/StaticAnalyzer/Checkers/GenericTaintChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/GenericTaintChecker.cpp
@@ -431,7 +431,7 @@
   if (AddrVal.isUnknownOrUndef())
     return 0;
 
-  llvm::Optional<Loc> AddrLoc = AddrVal.getAs<Loc>();
+  Optional<Loc> AddrLoc = AddrVal.getAs<Loc>();
   if (!AddrLoc)
     return 0;