[llvm] [Coroutines] Support for Custom ABIs (PR #111755)

[Chuanqi Xu via llvm-commits]

https://github.com/ChuanqiXu9 commented:

For such changes, we need to update coroutines.rst (the https://llvm.org/docs/Coroutines.html page)

https://github.com/llvm/llvm-project/pull/111755