[X86] LowerShuffle - don't call canonicalizeShuffleMaskWithHorizOp if we could shuffle whole lanes (#170838) canonicalizeShuffleMaskWithHorizOp was getting stuck as it was canonicalizing a SHUFFLE(HADD(X,X)) to only refer to the results of the LHS X, but the original shuffle was shuffling entire lanes (with VPERM2F128), and the canonicalised shuffle was then attempting to lowering back to the original VPERM2F128 pattern. I think we can drop this call to canonicalizeShuffleMaskWithHorizOp once #143000 is addressed as vectorcombine should fold away all the patterns this addresses. Fixes #167793
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