[llvm] [SelectionDAG] Fold (icmp eq/ne (shift X, C), 0) -> (icmp eq/ne X, 0) (PR #88801)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm commented:

I kind of expect these flags to be present on the incoming IR, and combines need to do a better job of preserving them. Are there any examples where you need to recover the flags with value tracking late?

https://github.com/llvm/llvm-project/pull/88801