Simon Pilgrim ec910751fe [X86] combineX86ShufflesRecursively - attempt to fold ISD::EXTRACT_SUBVECTOR into a shuffle chain
Peek through if we're extracting a non-zero'th subvector in an attempt to fold the extract into a lane-crossing shuffle

This also exposes a failure to fold extract_subvector(movddup(x),c) -> movddup(extract_subvector(x,c))
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