Function safe_arch::get_f64_from_m128d_s

#[must_use]pub fn get_f64_from_m128d_s(a: m128d) -> f64

This is supported with target feature sse2 only.

Gets the lower lane as an f64 value.

let a = m128d::from_array([1.0, 2.5]);
let b = get_f64_from_m128d_s(a);
assert_eq!(b, 1.0_f64);