[llvm] [LoopPeel] Allow bidirection condition change for last iteration peeling (PR #143562)

[Philip Reames via llvm-commits]

preames wrote:

https://github.com/llvm/llvm-project/pull/143588 is a fix for the issue noted in my previous comments.  This change isn't technically dependent on that one, but I'd like to wait for it since they touch the same set of tests.  

https://github.com/llvm/llvm-project/pull/143562