[clang] [llvm] [CoroEarly] Infer presplitcoroutine attribute for Switch-Resumed ABI (PR #169866)

[Chuanqi Xu via llvm-commits]

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ChuanqiXu9 wrote:

> Is there a specific reason we do not promote CoroEarly ahead of AlwaysInliner?

I remember inlining may break some requirement of Coro passes. (But I failed to recall the specific reason). I am suprised that AlwaysInliner pass may run before CoroEarly. This seems in consistent to me.

> Switch ABI requires the frontend to set the presplitcoroutine attribute

If we're able to infer this, maybe we don't need to ask for this any more.

https://github.com/llvm/llvm-project/pull/169866