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[X86] Don't disable code in combineHorizontalPredicateResult just because we…

Authored by craig.topper on Feb 11 2020, 1:14 PM.

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[X86] Don't disable code in combineHorizontalPredicateResult just because we have avx512

We aren't doing a good job of optimizing AVX512 outside of this code. So remove the bail out for AVX512 and replace with a FIXME. This at least gets us the AVX2 codegen.

Differential Revision: https://reviews.llvm.org/D74431