[X86] Fix a bad cast from mask16 to mask8 in _mm256_mask_cvtepi16_epi8 introduced in r332266.

llvm-svn: 332738

Author: topperc

clang/lib/Headers/avx512vlbwintrin.h

@@ -1556,14 +1556,14 @@ _mm256_cvtepi16_epi8 (__m256i __A) {
 
 static __inline__ __m128i __DEFAULT_FN_ATTRS
 _mm256_mask_cvtepi16_epi8 (__m128i __O, __mmask16 __M, __m256i __A) {
-  return (__m128i)__builtin_ia32_selectb_128((__mmask8)__M,
+  return (__m128i)__builtin_ia32_selectb_128((__mmask16)__M,
                                              (__v16qi)_mm256_cvtepi16_epi8(__A),
                                              (__v16qi)__O);
 }
 
 static __inline__ __m128i __DEFAULT_FN_ATTRS
 _mm256_maskz_cvtepi16_epi8 (__mmask16 __M, __m256i __A) {
-  return (__m128i)__builtin_ia32_selectb_128((__mmask8)__M,
+  return (__m128i)__builtin_ia32_selectb_128((__mmask16)__M,
                                              (__v16qi)_mm256_cvtepi16_epi8(__A),
                                              (__v16qi)_mm_setzero_si128());
 }