[llvm] SelectionDAG: Support FMINIMUMNUM and FMINIMUM in combineMinNumMaxNumImpl (PR #137449)

[Matt Arsenault via llvm-commits]

https://github.com/arsenm commented:

Can you add more test coverage? The wasm test changes look incidental since they are derived from the vector reductions 

https://github.com/llvm/llvm-project/pull/137449