Function safe_arch::add_i64_m128i

#[must_use]pub fn add_i64_m128i(a: m128i, b: m128i) -> m128i

This is supported with target feature sse2 only.

Lanewise a + b with lanes as i64.

let a = m128i::from([92_i64, 87]);
let b = m128i::from([-9001_i64, 1]);
let c: [i64; 2] = add_i64_m128i(a, b).into();
assert_eq!(c, [-8909, 88]);