[PATCH] AVX-512 ERI Instrinsics for scalar instructions

[Elena Demikhovsky]

Hi anemet, rob.khasanov,

Added a full coverage for scalar ERI intrinsics, including SAE mode and memory operand.
Added AVX512_maskable_scalar template, that should cover all scalar instructions in the future.

The main difference between AVX512_maskable_scalar<> and AVX512_maskable<> is using X86select instead of vselect.
I need it, because I can't create vselect node for MVT::i1 mask for scalar instruction.

http://reviews.llvm.org/D6378

Files:
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86InstrAVX512.td
  lib/Target/X86/X86InstrFragmentsSIMD.td
  lib/Target/X86/X86IntrinsicsInfo.h
  test/CodeGen/X86/avx512er-intrinsics.ll
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