Function safe_arch::unpack_low_m128

#[must_use]pub fn unpack_low_m128(a: m128, b: m128) -> m128

This is supported with target feature sse only.

Unpack and interleave low lanes of a and b.

let a = m128::from_array([1.0, 2.0, 3.0, 4.0]);
let b = m128::from_array([5.0, 6.0, 7.0, 8.0]);
let c = unpack_low_m128(a, b).to_array();
assert_eq!(c, [1.0, 5.0, 2.0, 6.0]);