[clang] Added macro name to redifine and undef macro as a part of the issue#88882 (PR #167299)

[Yanzuo Liu via cfe-commits]

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@@ -3289,7 +3289,7 @@ void Preprocessor::HandleDefineDirective(
       // Warn if defining "__LINE__" and other builtins, per C99 6.10.8/4 and
       // C++ [cpp.predefined]p4, but allow it as an extension.
       if (isLanguageDefinedBuiltin(SourceMgr, OtherMI, II->getName()))
-        Diag(MacroNameTok, diag::ext_pp_redef_builtin_macro);
+        Diag(MacroNameTok, diag::ext_pp_redef_builtin_macro) << MacroNameTok.getIdentifierInfo(); // inserting this diagonstic message into stream.
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zwuis wrote:

Unnecessary comment. Ditto below.

https://github.com/llvm/llvm-project/pull/167299