Simon Pilgrim 488861d0e3 [X86] Add SimplifyMultipleUseDemandedBitsForTargetNode X86ISD::ANDNP handling
See if we can remove X86ISD::ANDNP nodes by checking the state of the knownbits of the demanded elements.

This is equivalent to the generic ISD::AND handling, but flips the bits of the LHS operand to account for ANDNP.

Differential Revision: https://reviews.llvm.org/D128216
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