PATCH to fix warnings in avx headers

PATCH to fix warnings in avx headers

[Jason Merrill]

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Warnings are suppressed in these headers by default, but I noticed some 
after preprocessing and stripping # lines.  A few functions were missing 
return types, and _mm256_broadcast_f32x2 was passing a constant value 
that overflows the 8-bit type of the parameter.

Tested x86_64-pc-linux-gnu, applying to trunk as obvious.

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commit db1c21e59e91f821ef33ab1f324507992ba5ba2f
Author: Jason Merrill <jason@redhat.com>
Date:   Fri Nov 7 20:21:56 2014 -0600

    	* config/i386/avx512vldqintrin.h (_mm256_broadcast_f32x2): __mmask8.
    	* config/i386/avx512vlintrin.h (_mm256_mask_cvtepi32_storeu_epi16)
    	(_mm_mask_cvtusepi32_storeu_epi16)
    	(_mm_mask_cvtsepi64_storeu_epi32): Return void.

diff --git a/gcc/config/i386/avx512vldqintrin.h b/gcc/config/i386/avx512vldqintrin.h
index 43a7388..4ad1fd7 100644
--- a/gcc/config/i386/avx512vldqintrin.h
+++ b/gcc/config/i386/avx512vldqintrin.h
@@ -453,7 +453,7 @@ _mm256_broadcast_f32x2 (__m128 __A)
 {
   return (__m256) __builtin_ia32_broadcastf32x2_256_mask ((__v4sf) __A,
 						          (__v8sf)_mm256_undefined_ps(),
-							  (__mmask16) -
+							  (__mmask8) -
 							  1);
 }
 
diff --git a/gcc/config/i386/avx512vlintrin.h b/gcc/config/i386/avx512vlintrin.h
index f39f7f3..a042e8c 100644
--- a/gcc/config/i386/avx512vlintrin.h
+++ b/gcc/config/i386/avx512vlintrin.h
@@ -1710,7 +1710,7 @@ _mm256_cvtepi32_epi16 (__m256i __A)
 						  (__mmask8) -1);
 }
 
-extern __inline
+extern __inline void
 __attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
 _mm256_mask_cvtepi32_storeu_epi16 (void *  __P, __mmask8 __M, __m256i __A)
 {
@@ -1813,7 +1813,7 @@ _mm_cvtusepi32_epi16 (__m128i __A)
 						    (__mmask8) -1);
 }
 
-extern __inline
+extern __inline void
 __attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
 _mm_mask_cvtusepi32_storeu_epi16 (void * __P, __mmask8 __M, __m128i __A)
 {
@@ -2360,7 +2360,7 @@ _mm_cvtsepi64_epi32 (__m128i __A)
 						   (__mmask8) -1);
 }
 
-extern __inline
+extern __inline void
 __attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
 _mm_mask_cvtsepi64_storeu_epi32 (void * __P, __mmask8 __M, __m128i __A)
 {