[X86][AVX] Fold CONCAT(HOP(X,Y),HOP(Z,W)) -> HOP(CONCAT(X,Z),CONCAT(Y,W)) for float types
Only do this for AVX2+ targets as we still get some regressions on AVX1 without PERMPD/PERMQ
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Only do this for AVX2+ targets as we still get some regressions on AVX1 without PERMPD/PERMQ