[llvm] [AArch64] optimize lowering for icmp on i128 when RHS is an immediate (PR #181822)

[David Green via llvm-commits]

davemgreen wrote:

> I have done a cleanup and separated the performSETCCCARRYCombine from this PR. I will open another one once this is merged.

Perhaps I should look again, but the performSETCCCARRYCombine part looked more straight forward and self-contained. Feel free to put it up if it is separate.

https://github.com/llvm/llvm-project/pull/181822