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

[Cheng Lingfei via llvm-commits]

clingfei wrote:

Thanks for your review @davemgreen!

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

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