Function multi_exponentiate_montgomery_form_internal 

const fn multi_exponentiate_montgomery_form_internal<const LIMBS: usize, const RHS_LIMBS: usize>(
    powers_and_exponents: &[([Uint<LIMBS>; 16], Uint<RHS_LIMBS>)],
    exponent_bits: usize,
    modulus: &Uint<LIMBS>,
    r: &Uint<LIMBS>,
    mod_neg_inv: Limb,
) -> Uint<LIMBS>