Function safe_arch::mul_m256

#[must_use]pub fn mul_m256(a: m256, b: m256) -> m256

This is supported with target feature avx only.

Lanewise a * b with f32 lanes.

let a = m256::from_array([1.0, 2.0, 3.0, 4.0, 20.0, 30.0, 40.0, 50.0]);
let b = m256::from_array([5.0, 6.0, 7.0, 8.5, 90.0, 100.0, 110.0, 51.0]);
let c = mul_m256(a, b).to_array();
assert_eq!(c, [5.0, 12.0, 21.0, 34.0, 1800.0, 3000.0, 4400.0, 2550.0]);