[X86] Add back AVX2 VR256 PMOVX patterns.
We can't reach those from zext, but other parts of the backend (the shuffle lowering) generate 256-bit VZEXT nodes. Fixes PR21876. llvm-svn: 223996
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We can't reach those from zext, but other parts of the backend (the shuffle lowering) generate 256-bit VZEXT nodes. Fixes PR21876. llvm-svn: 223996