[X86] SimplifyDemandedVectorEltsForTargetNode - merge shuffle/pack lower...
[X86] SimplifyDemandedVectorEltsForTargetNode - merge shuffle/pack lower demanded elements handling. Generalize the vector operand extraction code for shuffle/pack ops - we can assume that the vector operands are the same width as the result, and any non-vector values can be reused directly in the smaller width op.
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