[llvm] [InstCombine] Don't convert a compare+select into a minnum/maxnum intrinsic that can't be lowered back to a compare+select (PR #177821)

[Matt Arsenault via llvm-commits]

arsenm wrote:

The problem I ran into is a few vectorizer tests regressed. Those need to be taught to directly vectorize compare and select 

https://github.com/llvm/llvm-project/pull/177821