[clang] [Clang] Warn about `[[noreturn]]` on coroutines (PR #127623)

[via cfe-commits]

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@@ -1176,6 +1176,10 @@ void Sema::CheckCompletedCoroutineBody(FunctionDecl *FD, 
Stmt *&Body) {
   for (AddrLabelExpr *ALE : Fn->AddrLabels)
     Diag(ALE->getBeginLoc(), diag::err_coro_invalid_addr_of_label);
 
+  // Coroutines always return a handle, so they can't be [[noreturn]].
+  if (Fn->isCoroutine())
+    Diag(FD->getLocation(), diag::warn_noreturn_coroutine) << FD;
----------------
Nerixyz wrote:

Yea, just noticed that I wanted to check if it's noreturn 😅 

https://github.com/llvm/llvm-project/pull/127623
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