[X86][AVX] canonicalizeLaneShuffleWithRepeatedOps - remove unnecessary BITCASTs.
In conjunction with the 'vperm2x128(bitcast(x),bitcast(y),c) -> bitcast(vperm2x128(x,y,c))' fold in combineTargetShuffle, this should remove any unnecessary bitcasts around vperm2x128 lane shuffles.
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