[PATCH] [X86] replace vextractf128 intrinsics with generic shuffles

[Sanjay Patel]

Hi craig.topper, chandlerc, RKSimon, andreadb,

This is very much like D8088 (checked in here: http://llvm.org/viewvc/llvm-project?rev=231794&view=rev ).

Now that we've replaced the vinsertf128 intrinsics, do the same for their extract twins.

http://reviews.llvm.org/D8275

Files:
  include/clang/Basic/BuiltinsX86.def
  lib/Headers/avxintrin.h
  lib/Sema/SemaChecking.cpp
  test/CodeGen/avx-shuffle-builtins.c
  test/CodeGen/builtins-x86.c

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