[llvm] [AArch64] Add missing arithmetic to arith+cb(n)z clustering (PR #203721)

[David Green via llvm-commits]

davemgreen wrote:

If this is how the Apple CPU works it sounds fine to me. I have not idea if this is how the cpu works though, so it would be good to get an extra opinion on that.

https://github.com/llvm/llvm-project/pull/203721