[llvm] [ExpandMemCmp] Recognize canonical form of (icmp sle/sge X, 0) in getMemCmpOneBlock. (PR #121540)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

I think it's okay to special-case these for now. Longer term the plan was to move ExpandMemCmp to the middle-end pipeline (I think there's a PR for that...), in which case we could drop this an let InstCombine deal with it.

https://github.com/llvm/llvm-project/pull/121540