[PATCH] Patched clang to emit x86 blends as shufflevectors.

[Filipe Cabecinhas]

Hi eli.friedman, craig.topper,

Most of the clang header patch by Simon Pilgrim @ SCEE.
Also fixed (or added) clang tests for these intrinsics.

LLVM tests to make sure we get the blend instruction out of these
shufflevectors are at http://reviews.llvm.org/D3600

http://reviews.llvm.org/D3601

Files:
  lib/Headers/avx2intrin.h
  lib/Headers/avxintrin.h
  lib/Headers/smmintrin.h
  test/CodeGen/avx-builtins.c
  test/CodeGen/avx2-builtins.c
  test/CodeGen/sse-builtins.c
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