[llvm] [InstCombine] Fold negation of unsigned div of non-negatives (PR #84951)

[Nikita Popov via llvm-commits]

nikic wrote:

> Emm, this patch breaks `div + rem` pairs :(

This is a good point... Maybe it's not worth doing this transform.

https://github.com/llvm/llvm-project/pull/84951