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

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@@ -318,6 +318,9 @@ def MustProgress : EnumAttr<"mustprogress", [FnAttr]>;
 /// Function is a presplit coroutine.
 def PresplitCoroutine : EnumAttr<"presplitcoroutine", [FnAttr]>;
 
+/// The coroutine would only be destroyed when it is done.
+def CoroDestroyOnlyWhenComplete : EnumAttr<"coro_only_destroy_when_done", [FnAttr]>;
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h-vetinari wrote:

still `_done` not `_complete`

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