Calculates the divisor when `self` is divided by `rhs`.
Returns a tuple of the divisor along with a boolean indicating whether an
arithmetic overflow would occur. If an overflow would occur then self is
returned.
# Panics
This function will panic if `rhs` is zero.
# Examples
Basic usage:
```
# use ::exint::primitive::*;
# ::exint::uint! {
assert_eq!(5_i24.overflowing_div(2_i24), (2_i24, false));
assert_eq!(i24::MIN.overflowing_div(-1_i24), (i24::MIN, true));
# }
```