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

[Chuanqi Xu via llvm-commits]

ChuanqiXu9 wrote:

> > For such changes, we need to update coroutines.rst (the https://llvm.org/docs/Coroutines.html page)
> 
> Should I include this (#111781) in the same PR? Perhaps I wrongly assumed that updating the docs should be a separate PR.

It is fine to seperate them. I just didn't know it.

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