[X86] Correct a bad isel predicate. Though I don't think it can be exposed.

This B/W VPTEST instructions are only available with AVX512BW. But lowering should prevent any byte or word elements from getting to isel so this can't be exposed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@345112 91177308-0d34-0410-b5e6-96231b3b80d8
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