[llvm] [GlobalIsel] Visit ICmp (PR #105991)

[Thorsten Schütt via llvm-commits]

tschuett wrote:

It is open discussion whether the backend combiners are purely cleaning up legalization artefacts or do they go beyond:
https://github.com/llvm/llvm-project/issues/92309
For the DAG combiner, I would argue that it goes far beyond. In my first comment above and in the AMDGPU code, you can see that the combine hits.

The move constants to the right also hits.

https://github.com/llvm/llvm-project/pull/105991