`algorithms/gcd/mod`: Make these algorithms work on limb slices.

[github-actions]

On 2024-12-16 @prestwich wrote in e657576 “Merge pull request #402 from recmo/recmo/montgomery”:

Make these algorithms work on limb slices.

#![allow(clippy::module_name_repetitions)]

// TODO: https://github.com/bitcoin-core/secp256k1/blob/master/doc/safegcd_implementation.md

// TODO: Make these algorithms work on limb slices.
mod matrix;

pub use self::matrix::Matrix as LehmerMatrix;
use crate::Uint;
use core::mem::swap;

From src/algorithms/gcd/mod.rs:5