[X86] Add more intrinsics to match icc.

This adds
_mm_loadu_epi8, _mm256_loadu_epi8, _mm512_loadu_epi8
_mm_loadu_epi16, _mm256_loadu_epi16, _mm512_loadu_epi16
_mm_storeu_epi8, _mm256_storeu_epi8, _mm512_storeu_epi8
_mm_storeu_epi16, _mm256_storeu_epi16, _mm512_storeu_epi16

llvm-svn: 344862