[PATCH] Adding _mm_prefetch and other builtins

[Warren Hunt]

Hi hans,

This patch adds several built-ins that are required for ms compatibility.  _mm_prefetch must be a built-in because it takes a compile-time constant argument and our prior approach of using a #define to the current built-in doesn't work in the presence of re-declaration of _mm_prefetch.  The others can be obtained by including the windows system headers.  If a user includes the windows system headers but not intrin.h they still need to work and therefore must be built-in because we don't get a chance to implement them in intrin.h in this case.

http://llvm-reviews.chandlerc.com/D2822

Files:
  include/clang/Basic/BuiltinsX86.def
  include/clang/Sema/Sema.h
  lib/CodeGen/CGBuiltin.cpp
  lib/Headers/Intrin.h
  lib/Headers/xmmintrin.h
  lib/Sema/SemaChecking.cpp
  test/CodeGen/ms-builtins.c
  test/Headers/mmprefetch.c
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