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

[Elizaveta Noskova via llvm-commits]

enoskova-sc wrote:

@asb, thanks for pointing out MFI.hasVarSizedObjects—it seems suitable for detecting functions that use alloca. I’ll try using it to relax the current restrictions.

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