Function _mm512_mask_cmp_epi8_mask
#[target_feature(enable = "avx512bw")]
pub const fn _mm512_mask_cmp_epi8_mask(k1: __mmask64, a: __m512i, b: __m512i, IMM8: i32) -> __mmask64Compare packed signed 8-bit integers in a and b based on the comparison operand specified by imm8, and store the results in mask vector k using zeromask k1 (elements are zeroed out when the corresponding mask bit is not set).