[llvm] [CodeGen] Don't schedule across frame register save/restore for sanitized functions (PR #221714)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm commented:

This doesn't feel right. Why has nobody run into this problem before?

The frame register writes I expect would be stack realignment in the prolog, and also have the FrameSetup flag? 

https://github.com/llvm/llvm-project/pull/221714