[llvm] [Draft] Support save/restore point splitting in shrink-wrap (PR #119359)

[Elizaveta Noskova via llvm-commits]

enoskova-sc wrote:

@asb, currently, I don't have rebased version. But If you wait a little bit I can rebase this MR and push here.

https://github.com/llvm/llvm-project/pull/119359