[clang] Better diagnostics when assertion fails in `consteval` (PR #130458)

[Yanzuo Liu via cfe-commits]

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@@ -5975,9 +5975,15 @@ static bool CheckConstexprFunction(EvalInfo &Info, 
SourceLocation CallLoc,
                                         
Definition->hasAttr<MSConstexprAttr>())))
     return true;
 
-  if (Info.getLangOpts().CPlusPlus11) {
-    const FunctionDecl *DiagDecl = Definition ? Definition : Declaration;
+  const FunctionDecl *DiagDecl = Definition ? Definition : Declaration;  
+  if (CallLoc.isMacroID() && (DiagDecl->getName() == "__assert_rtn" ||
----------------
zwuis wrote:

Please leave a comment that how this can be improved 
(https://github.com/llvm/llvm-project/pull/130458#discussion_r1987629037) if 
you don't fully implement 
https://github.com/llvm/llvm-project/pull/130458#discussion_r1987629037 .

https://github.com/llvm/llvm-project/pull/130458
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