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

[Philip Reames via llvm-commits]

preames wrote:

@enoskova-sc small review process request.  Each time you add "addressed" to a conversation, that triggers a separate email.  It's really hard to find the meaningful updates between all the spam.  You can either "mark resolved" if you're really really sure the thread is resolved (i.e. stylistic issues), or just put a summary comment on the review (i.e. one email, not many)

Real review to follow in a bit.

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