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

[Nikita Popov via llvm-commits]

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https://github.com/nikic requested changes to this pull request.

This needs to be split up into separate PRs, where each only adds a single fold, and each fold is well justified.

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".

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