[llvm] [InstCombine] Fold (X / C) < X and (X >> C) < X into X > 0 (PR #85555)

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goldsteinn wrote:

Also welcome and thank you for the commit. There a rough draft of a contribution guide for `InstCombine` here: #79007

You might find it useful.

https://github.com/llvm/llvm-project/pull/85555