[clang] [clang][CodeGen] Promote point of GRO(CWG2563) (PR #151067)

[Chuanqi Xu via cfe-commits]

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@@ -691,7 +730,7 @@ struct GetReturnObjectManager {
   // split its emission in two parts. EmitGroAlloca emits an alloca and sets up
   // cleanups. Later when coroutine promise is available we initialize the gro
   // and sets the flag that the cleanup is now active.
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ChuanqiXu9 wrote:

We need to update the comments too.

https://github.com/llvm/llvm-project/pull/151067