Function safe_arch::load_i64_m128i_s

#[must_use]pub fn load_i64_m128i_s(a: &m128i) -> m128i

This is supported with target feature sse2 only.

Loads the low i64 into a register.

let a = m128i::from([1_i64, 2]);
let b = load_i64_m128i_s(&a);
assert_eq!([1_i64, 0], <[i64; 2]>::from(b));