[llvm] [SCEV] Retain SCEVSequentialMinMaxExpr if an operand may trigger UB. (PR #92177)

[Nikita Popov via llvm-commits]

nikic wrote:

> I also added SCEV-only tests, so the SCEV changes could be separated from the SCEVExpander changes if preferred

Yeah, I think it would be good to split off this change.

https://github.com/llvm/llvm-project/pull/92177