Module malachite_base::num::arithmetic::x_mul_y_to_zz

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XMulYToZZ, a trait for multiplying two numbers and returning the result as a double-width number.

§x_mul_y_to_zz

use malachite_base::num::arithmetic::traits::XMulYToZZ;

assert_eq!(u64::x_mul_y_to_zz(15, 3), (0, 45));
assert_eq!(u8::x_mul_y_to_zz(0x78, 0x9a), (0x48, 0x30));