[PATCH] [AVX512] Implemented masking for integer arithmetic & logic instructions.

[Robert Khasanov]

  Elena, please see new patch.
  I added lowering logic masking&broadcasting for these instructions w/lit-tests.

Hi delena, craig.topper,

http://llvm-reviews.chandlerc.com/D3068

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D3068?vs=7797&id=8126#toc

Files:
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86InstrAVX512.td
  lib/Target/X86/X86InstrInfo.cpp
  test/CodeGen/X86/avx512-arith.ll
  test/CodeGen/X86/viabs.ll
  test/MC/X86/avx512-encodings.s
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