[llvm] [AArch64] Use ccmn to compare negative imm constants (PR #95825)

[David Green via llvm-commits]

https://github.com/davemgreen commented:

We would usually split the SDAG and GISel parts into separate patches, but from what I can tell this is OK for any predicate so long as it is a constant.

https://github.com/llvm/llvm-project/pull/95825