[clang] Diagnose the code with trailing comma in the function call. (PR #125232)

[via cfe-commits]

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@@ -2237,6 +2237,9 @@ Parser::ParsePostfixExpressionSuffix(ExprResult LHS) {
             if (PP.isCodeCompletionReached() && !CalledSignatureHelp)
               RunSignatureHelp();
             LHS = ExprError();
+          } else if (!HasError && HasTrailingComma) {
+            // FIXME: add a FIXIT to remove the trailing comma.
+            Diag(Tok, diag::err_extraneous_trailing_comma);
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cor3ntin wrote:

I think we should just reuse `err_expected_expression`. The important point 
here is that there is a diagnostic.
Note sure this happens often enough to warrant a fixit

https://github.com/llvm/llvm-project/pull/125232
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