[llvm] [llvm] Support multiple save/restore points in mir (PR #119357)

[Elizaveta Noskova via llvm-commits]

enoskova-sc wrote:

@michaelmaitland, now multiple save and restore points are not supported in shrink-wrap. This patch only support possibility to print them in MIR. Real multiple save/restore points can appear only in https://github.com/llvm/llvm-project/pull/119359.

https://github.com/llvm/llvm-project/pull/119357