[llvm] [AArch64] Take cmn into account when adjusting compare constants (PR #98634)

[David Green via llvm-commits]

https://github.com/davemgreen commented:

Sorry for the delay. I have been busy with some other things and this code isn't something I know super well. It sounds OK to me. Do you have any example of where it does reduce the number of instructions?

https://github.com/llvm/llvm-project/pull/98634