[PATCH] [Headers] Improve codegen for _mm_slli_epi32.

[Michael Spencer]

Hi dblaikie,

This generates vector llvm ir for _mm_slli_epi32 to allow
further optimization.

http://reviews.llvm.org/D3353

Files:
  lib/Headers/emmintrin.h

Index: lib/Headers/emmintrin.h
===================================================================
--- lib/Headers/emmintrin.h
+++ lib/Headers/emmintrin.h
@@ -846,7 +846,7 @@
 static __inline__ __m128i __attribute__((__always_inline__, __nodebug__))
 _mm_slli_epi32(__m128i __a, int __count)
 {
-  return (__m128i)__builtin_ia32_pslldi128((__v4si)__a, __count);
+  return (__m128i)((__v4si)__a << (__v4si){__count, __count, __count, __count});
 }
 
 static __inline__ __m128i __attribute__((__always_inline__, __nodebug__))
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