[Parser] Change parameter type from int to enum

Some parser functions accept argument of type unsigned while it is
actually of type DeclSpec::TST. No functional changes.

Differential Revision: https://reviews.llvm.org/D65406

llvm-svn: 367545
diff --git a/clang/lib/Parse/ParseDeclCXX.cpp b/clang/lib/Parse/ParseDeclCXX.cpp
index 9c61c4d..9126da7 100644
--- a/clang/lib/Parse/ParseDeclCXX.cpp
+++ b/clang/lib/Parse/ParseDeclCXX.cpp
@@ -4337,7 +4337,7 @@
   while (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
     // __if_exists, __if_not_exists can nest.
     if (Tok.isOneOf(tok::kw___if_exists, tok::kw___if_not_exists)) {
-      ParseMicrosoftIfExistsClassDeclaration((DeclSpec::TST)TagType,
+      ParseMicrosoftIfExistsClassDeclaration(TagType,
                                              AccessAttrs, CurAS);
       continue;
     }