ch_qhash64
uint64_t ch_qhash64(uint64_t, uint64_t);
h = ch_qhash64(attrkey, (uintptr_t)a->aspath);
h = ch_qhash64(h, (uintptr_t)a->communities);
h = ch_qhash64(h, (uintptr_t)a->nexthop);
h = ch_qhash64(h, (uintptr_t)pp->pt);
h = ch_qhash64(h, pp->path_id_tx);
h = ch_qhash64(h, (uintptr_t)pa->attrs);
h = ch_qhash64(h, pa->aid);