[llvm] [InstCombine] Preserve range information for `Op0 -nsw umin(X, Op0) --> usub.sat(Op0, X)` (PR #170989)

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ParkHanbum wrote:

Ah! I thought I had to implement it by adding an instruction to make it behave similarly to NSW. I see I could have used range. I was mistaken.


https://github.com/llvm/llvm-project/pull/170989