[PATCH] [X86] Replace (v)palignr intrinsics with generic shuffles (Clang)

[Simon Pilgrim]

Hi craig.topper, andreadb, spatel, chandlerc,

The (v)palignr instructions are currently described using builtin intrinsics although the x86 shuffle lowering code now correctly identifies them.

This patch replaces the builtins with generic __builtin_shufflevector calls. I'll be posting a LLVM equivalent patch shortly.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8301

Files:
  include/clang/Basic/BuiltinsX86.def
  lib/CodeGen/CGBuiltin.cpp
  lib/Headers/avx2intrin.h
  lib/Headers/tmmintrin.h
  test/CodeGen/avx2-builtins.c
  test/CodeGen/builtins-x86.c
  test/CodeGen/palignr.c
  test/CodeGen/sse-builtins.c

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