`algorithms/div/small`: Version with in-place shifting of `u`

[github-actions]

On 2022-10-24 @recmo wrote in fb3aa20 “Merge pull request #172 from recmo/div2”:

Version with in-place shifting of u

/// The divisor must be normalized. See algorithm 7 from [MG10].
///
/// [MG10]: https://gmplib.org/~tege/division-paper.pdf
#[inline(always)]
pub fn div_nx1_normalized(u: &mut [u64], d: u64) -> u64 {
    // OPT: Version with in-place shifting of `u`
    debug_assert!(d >= (1 << 63));

    let v = reciprocal(d);
    let mut r: u64 = 0;
    for u in u.iter_mut().rev() {

From src/algorithms/div/small.rs:25