[llvm] [InstCombine] Reassociate commutative binops over select/phi/minmax (PR #187493)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> I'm still not sure whether to use OuterOp.dropUnknownNonDebugMetadata();, dropUBImplyingAttrsAndMetadata, or dropUBImplyingAttrsAndUnknownMetadata

Known metadata listed in dropUBImplyingAttrsAndMetadata is safe to keep.



https://github.com/llvm/llvm-project/pull/187493