[PATCH] [x86] Simplify vector selection

[Robert Khasanov]

Added a test case for VSELECT simplification.
Removed changes corresponding to intrinsics lowering, it will go as separate patch.

http://reviews.llvm.org/D5545

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/avx512-select.ll
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