[llvm] [clang] [Coroutines] Introduce [[clang::coro_only_destroy_when_complete]] (PR #71014)

[Chuanqi Xu via cfe-commits]

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@@ -777,6 +777,12 @@ void CodeGenFunction::EmitCoroutineBody(const CoroutineBodyStmt &S) {
 
   // LLVM require the frontend to mark the coroutine.
   CurFn->setPresplitCoroutine();
+
+  {
+    CXXRecordDecl *RD = FnRetTy->getAsCXXRecordDecl();
+    if (RD && RD->hasAttr<CoroOnlyDestroyWhenCompleteAttr>())
+      CurFn->setCoroDestroyOnlyWhenDone();
+  }
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ChuanqiXu9 wrote:

Got it. Thanks. Will do in the next round or landing.

https://github.com/llvm/llvm-project/pull/71014