Fix <rdar://problem/5956221> clang ObjC rewriter: Microsoft-specific __fastcall keyword unrecognized.

This fix is C++ specific.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@61816 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/ParseTentative.cpp b/lib/Parse/ParseTentative.cpp
index dd75319..11df2f4 100644
--- a/lib/Parse/ParseTentative.cpp
+++ b/lib/Parse/ParseTentative.cpp
@@ -624,6 +624,12 @@
   case tok::kw__Complex:
   case tok::kw___attribute:
     return TPResult::True();
+    
+    // Microsoft
+  case tok::kw___cdecl:
+  case tok::kw___stdcall:
+  case tok::kw___fastcall:
+    return PP.getLangOptions().Microsoft ? TPResult::True() : TPResult::False();
 
     // The ambiguity resides in a simple-type-specifier/typename-specifier
     // followed by a '('. The '(' could either be the start of: