[clang] [libcxx] [llvm] [Clang][CodeGen][Coroutines] Make coroutine startup exception-safe (CWG2935) (PR #177628)

[Chuanqi Xu via cfe-commits]

https://github.com/ChuanqiXu9 commented:

I didn't image the new warning may have such a large impact. It is better to split it into next PR, otherwise the progress to land the PR itself would be much longer.

https://github.com/llvm/llvm-project/pull/177628