Function _mm512_testn_epi8_mask
#[target_feature(enable = "avx512bw")]
pub const fn _mm512_testn_epi8_mask(a: __m512i, b: __m512i) -> __mmask64Compute the bitwise NAND of packed 8-bit integers in a and b, producing intermediate 8-bit values, and set the corresponding bit in result mask k if the intermediate value is zero.