[llvm] [InstCombine] Canonicalize `max(min(X, MinC), MaxC) -> min(max(X, MaxC), MinC)` (PR #136665)

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el-ev wrote:

> Looks reasonable. Is there any particular reason why we expect min(max) to be better than max(main), or is this basically chosen at random?

Mostly because it was suggested in the original issue. I'm not quite aware of the performance impact.

https://github.com/llvm/llvm-project/pull/136665