[PATCH] Scalarizer for masked vector intrinsics

[Elena Demikhovsky]

Hi hfinkel, anemet, rob.khasanov, jmolloy,

Masked vector intrinsics are a part of common LLVM IR, but they are really supported on AVX2 and AVX-512 targets.  I added a code that translates masked intrinsic for all other targets. The masked vector intrinsic is converted to a chain of scalar operations inside conditional basic blocks.
See more comments and code examples inside.

http://reviews.llvm.org/D6436

Files:
  lib/CodeGen/CodeGenPrepare.cpp
  lib/Target/X86/X86InstrSSE.td
  test/CodeGen/X86/masked_memop.ll
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