[llvm] [Coro] Allow spilling @llvm.coro.suspend() to the coro frame (PR #133088)

[Reid Kleckner via llvm-commits]

https://github.com/rnk approved this pull request.

I think it looks good, but please wait 48hrs for feedback from @ChuanqiXu9 

Nice debugging. :)

https://github.com/llvm/llvm-project/pull/133088