Function safe_arch::load_masked_m256d

#[must_use]pub fn load_masked_m256d(a: &m256d, mask: m256i) -> m256d

This is supported with target feature avx only.

Load data from memory into a register according to a mask.

When the high bit of a mask lane isn't set the loaded lane will be zero.

let a = m256d::from([8.0, 17.0, 16.0, 20.0]);
let b = load_masked_m256d(&a, m256i::from([0_i64, -1, -1, 0])).to_array();
assert_eq!(b, [0.0, 17.0, 16.0, 0.0]);