Function invert_odd_mod_precomp 

const fn invert_odd_mod_precomp<const LIMBS: usize, const VARTIME: bool>(
    a: &Uint<LIMBS>,
    m: &Odd<Uint<LIMBS>>,
    mi: u64,
    e: &Uint<LIMBS>,
) -> CtOption<Uint<LIMBS>>

Calculate the multiplicative inverse of a modulo m.