[PATCH] [X86] Add patterns for AVX2 VPMOV[SZ]XYrm intrinsics.

[Ahmed Bougacha]

Hi delena, craig.topper, qcolombet,

Title says all, there were a few of them missing, making us generate code like:

    movq  m64, xmm0
    vpmovzxbd   xmm0, ymm0

instead of:

   vpmovzxbd  m64, ymm0

I only glanced at the test results for non-AVX2, but them seemed correct.

http://reviews.llvm.org/D6125

Files:
  lib/Target/X86/X86InstrSSE.td
  test/CodeGen/X86/avx2-pmovxrm-intrinsics.ll
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