Function safe_arch::load_f64_m128d_s

#[must_use]pub fn load_f64_m128d_s(a: &f64) -> m128d

This is supported with target feature sse2 only.

Loads the reference into the low lane of the register.

let a = 1.0;
let b = load_f64_m128d_s(&a);
assert_eq!(m128d::from_array([1.0, 0.0]).to_bits(), b.to_bits());