_mm512_mask_cvtepi32_storeu_epi8 is VPMOVDB (convert from 32-bit to 8-bit
with truncation) where the destination is a memory address, with an
OpMask register used to indicate which of the lanes in the vector to
store. Similarly, _mm512_mask_cvtepi16_storeu_epi8 is VPMOVWB (convert
from 16-bit o 8-bit), which is useful for UTF-16 to Latin1 conversion.
Change-Id: I8f261579aad648fdb4f0fffd15542ea306841ce6
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
d241616e41