[clang] [clang] Suggest using __VA_OPT__(,) instead of GNU zero variadic macro argument (PR #188624)

[via cfe-commits]

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@@ -523,7 +530,16 @@ void TokenLexer::ExpandFunctionArguments() {
           Macro->isVariadic()) {
         VaArgsPseudoPaste = true;
         // Remove the paste operator, report use of the extension.
-        PP.Diag(ResultToks.pop_back_val().getLocation(), 
diag::ext_paste_comma);
+        const bool VaOptSupport = hasVaOptSupport(PP.getLangOpts());
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serge-sans-paille wrote:

ok, out-of-curiosity, why is non-const prefered?

https://github.com/llvm/llvm-project/pull/188624
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