[PATCH] [X86] Refactor PMOV[SZ]Xrm to add missing AVX2 patterns.

[Ahmed Bougacha]

I followed Elena's advice to use X86IntrinsicsInfo, and got a bit carried away: I removed the existing PMOVX intrinsic patterns, and unified them into only X86v[sz]ext patterns.

So let's just say this patch is about refactoring the PMOVX handling, which happens to add a few of the missing patterns.
If people don't like pattern multiclasses I also have the handwritten version (just adding the patterns in the right places), which I guess is easier to read.

http://reviews.llvm.org/D6125

Files:
  lib/Target/X86/X86InstrSSE.td
  lib/Target/X86/X86IntrinsicsInfo.h
  test/CodeGen/X86/avx2-pmovxrm-intrinsics.ll
  test/CodeGen/X86/vector-sext.ll
  test/CodeGen/X86/vector-zext.ll
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