Fix an issue where we erroneously diagnose a [[noreturn]] function with warn_suggest_noreturn_function

Author: term-est

clang/lib/Sema/SemaDeclAttr.cpp

@@ -1976,8 +1976,8 @@ void clang::inferNoReturnAttr(Sema &S, const Decl *D) {
       Diags.isIgnored(diag::warn_suggest_noreturn_function, FD->getLocation()))
     return;
 
-  if (!FD->hasAttr<NoReturnAttr>() && !FD->hasAttr<InferredNoReturnAttr>() &&
-      isKnownToAlwaysThrow(FD)) {
+  if (!FD->hasAttr<NoReturnAttr>() && !FD->hasAttr<CXX11NoReturnAttr>() &&
+      !FD->hasAttr<InferredNoReturnAttr>() && isKnownToAlwaysThrow(FD)) {
     NonConstFD->addAttr(InferredNoReturnAttr::CreateImplicit(S.Context));
 
     // Emit a diagnostic suggesting the function being marked [[noreturn]].