[clang] [Clang] Properly parse enumeration declarations with fixed underlying type in generic associations (PR #210353)

[Aaron Ballman via cfe-commits]

================
@@ -602,6 +602,14 @@ bool Parser::isCXXTypeId(TentativeCXXTypeIdContext Context, bool &isAmbiguous) {
   return TPR == TPResult::True;
 }
 
+bool Parser::isNextCXXTypeId(TentativeCXXTypeIdContext Context,
+                             bool &isAmbiguous) {
+  RevertingTentativeParsingAction PA(*this);
+  ConsumeToken();
+  bool ret = isCXXTypeId(Context, isAmbiguous);
+  return ret;
----------------
AaronBallman wrote:

```suggestion
  return isCXXTypeId(Context, isAmbiguous);
```

https://github.com/llvm/llvm-project/pull/210353