[PATCH] [X86] replace vinsertf128 intrinsics with generic shuffles

[Sanjay Patel]

Hi chandlerc, craig.topper, qcolombet,

This is the sibling patch for the LLVM half of this change:
http://reviews.llvm.org/D8086

We want to remove as much custom x86 shuffling nonsense as possible.

For the avxintrin.h header, it's not clear to me how we decide between macro implementations and inline function implementations. I thought macros were generally frowned upon, so I went with inlines.

http://reviews.llvm.org/D8088

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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