[llvm] [X86] Remove single use assumption in combineVectorSizedSetCCEquality (PR #182200)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

We could trying flipping this on its head and always allow multiples uses of normal loads from mayFoldIntoVector - my fear being we end up with some similar problems to what we have with shouldReduceLoadWidth

https://github.com/llvm/llvm-project/pull/182200