[llvm] [AArch64] Check for negative numbers when adjusting icmps (PR #141151)

[via llvm-commits]

AZero13 wrote:

Do not revert the patch: it is not going to fix this issue because there are more improvements in other places and the proper fix for this might not involve modifying the patch at all, but rather I'm thinking of seeing if I can get CSE to try and group these together 

https://github.com/llvm/llvm-project/pull/141151