Function safe_arch::set_m128i_m256i

#[must_use]pub fn set_m128i_m256i(hi: m128i, lo: m128i) -> m256i

This is supported with target feature avx only.

Set m128i args into an m256i.

let a: [i64; 4] = set_m128i_m256i(
  set_i64_m128i(3_i64, 2),
  set_i64_m128i(1_i64, 0),
).into();
assert_eq!(a, [0_i64, 1, 2, 3]);