[llvm] [InstCombine] Fold Minimum over Trailing/Leading Bits Counts (PR #90402)

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mskamp wrote:

@nikic @RKSimon Thank you very much for your feedback. I've added support for non-uniform vectors to the implementation. Unfortunately, this has resulted in some substantial code changes but I've still tried to address your comments as much as possible.

https://github.com/llvm/llvm-project/pull/90402