Function multi_exponentiate_montgomery_form_internal 

const fn multi_exponentiate_montgomery_form_internal<const LIMBS: usize, const RHS_LIMBS: usize, const VARTIME: bool>(
    powers_and_exponents: &[([Uint<LIMBS>; 16], Uint<RHS_LIMBS>)],
    exponent_bits: u32,
    params: &FixedMontyParams<LIMBS>,
) -> Uint<LIMBS>