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

[Michael Maitland via llvm-commits]

michaelmaitland 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 #119359.

Can we have parser tests to show that it can consume multiple save/restore points?

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