[X86] Add AVX2 'fast-variable-shuffle' PHADD tests (PR39921)
Haswell etc. will combine shuffles to a extract_subvector(permd(x)) before isHorizontalBinOp can match it. llvm-svn: 362326
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Haswell etc. will combine shuffles to a extract_subvector(permd(x)) before isHorizontalBinOp can match it. llvm-svn: 362326