Function safe_arch::set_reversed_m128d

#[must_use]pub fn set_reversed_m128d(a: f64, b: f64) -> m128d

This is supported with target feature sse2 only.

Sets the args into an m128d, first arg is the low lane.

let a = m128d::from_array([0.0, 1.0]);
let b = set_reversed_m128d(0.0, 1.0);
assert_eq!(a.to_array(), b.to_array());