[clang] [Clang] Fix parsing of reversible type traits in template arguments (PR #95969)

[Mital Ashok via cfe-commits]

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@@ -1385,6 +1385,12 @@ Parser::isCXXDeclarationSpecifier(ImplicitTypenameContext AllowImplicitTypename,
     if (!getLangOpts().ObjC && Next.is(tok::identifier))
       return TPResult::True;
 
+    if (Next.is(tok::l_paren) &&
+        Tok.getIdentifierInfo()->hasRevertedTokenIDToIdentifier() &&
+        isRevertibleTypeTrait(Tok.getIdentifierInfo())) {
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MitalAshok wrote:

You can set the correct `tok::TokenKind` here too since it will be set later anyway when this is re-parsed as an expression

https://github.com/llvm/llvm-project/pull/95969