Function antic::_nmod_poly_mulhigh

pub unsafe extern "C" fn _nmod_poly_mulhigh(
    res: mp_ptr, 
    poly1: mp_srcptr, 
    len1: mp_limb_signed_t, 
    poly2: mp_srcptr, 
    len2: mp_limb_signed_t, 
    n: mp_limb_signed_t, 
    mod_: nmod_t
)