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We can always replace the undef elements in a vector constant with regular constants to get rid of the freeze: https://alive2.llvm.org/ce/z/nfRb4F The select diffs show that we might do better by adjusting the logic for a frozen select condition. We may also want to refine the vector constant replacement to consider forming a splat. Differential Revision: https://reviews.llvm.org/D123962