Function safe_arch::zero_extend_m128

#[must_use]pub fn zero_extend_m128(a: m128) -> m256

This is supported with target feature avx only.

Zero extend an m128 to m256

let a = zero_extend_m128(m128::from_array([1.0, 2.0, 3.0, 4.0])).to_array();
assert_eq!(a, [1.0, 2.0, 3.0, 4.0, 0.0, 0.0, 0.0, 0.0]);