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

[Thorsten Schütt via llvm-commits]

tschuett wrote:

@nikic  requested changes with the statement
"This PR is particularly problematic because it adds lot of expensive combines based on things like KnownBits -- these are very much not harmless folds you can add "just because"."

I am still looking for evidence of that claim.

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