Upgrade Microsoft's __int8, __int16, __int32 and __int64 types from builtin defines to real types.

Otherwise statements like:
  __int64 var = __int64(0);

would be expanded to:
  long long var = long long(0);

and fail to compile.

llvm-svn: 130369
diff --git a/clang/lib/Parse/ParseTentative.cpp b/clang/lib/Parse/ParseTentative.cpp
index 618c3e2..1c4e2b3 100644
--- a/clang/lib/Parse/ParseTentative.cpp
+++ b/clang/lib/Parse/ParseTentative.cpp
@@ -676,6 +676,7 @@
   case tok::kw_float:
   case tok::kw_int:
   case tok::kw_long:
+  case tok::kw___int64:
   case tok::kw_restrict:
   case tok::kw_short:
   case tok::kw_signed:
@@ -971,6 +972,7 @@
   case tok::kw_short:
   case tok::kw_int:
   case tok::kw_long:
+  case tok::kw___int64:
   case tok::kw_signed:
   case tok::kw_unsigned:
   case tok::kw_float: