Function _mm256_mask_mullo_epi64
#[target_feature(enable = "avx512dq", enable = "avx512vl")]
pub const fn _mm256_mask_mullo_epi64(src: __m256i, k: __mmask8, a: __m256i, b: __m256i) -> __m256iMultiply packed 64-bit integers in a and b, producing intermediate 128-bit integers, and store
the low 64 bits of the intermediate integers in dst using writemask k (elements are copied from
src if the corresponding bit is not set).