Function _mm256_shufflelo_epi16
#[target_feature(enable = "avx2")]
pub const fn _mm256_shufflelo_epi16(a: __m256i, IMM8: i32) -> __m256iShuffles 16-bit integers in the low 64 bits of 128-bit lanes of a using
the control in imm8. The high 64 bits of 128-bit lanes of a are copied
to the output.