[llvm] [InstCombine] simplify `icmp pred x, ~x` (PR #73990)

[via llvm-commits]

elhewaty wrote:

> @sftlbcn I took a rough look at it, I don't understand everything, but it's great! I also wanted to take a more general approach using bit, but It was difficult because I was a newbie.
> 
> should I close this PR?

No, you shouldn't, and you should ping the reviewer with in one week if there's not reply.
@dtcxzyw, ping.

https://github.com/llvm/llvm-project/pull/73990