[clang] [CIR] Implement FlattenCFG for coroutine AwaitOp, CoroBodyOp, and CoReturnOp (PR #203802)

[Bruno Cardoso Lopes via cfe-commits]

https://github.com/bcardosolopes commented:

Thanks for reviving this. My answer on the try_call question is below; the other two are about not landing wrong code: the destroy path, and the bool suspend from #227527.

https://github.com/llvm/llvm-project/pull/203802