dso__find_symbol
al.sym = dso__find_symbol(map__dso(al.map), al.addr);
sym = dso__find_symbol(dso, map__map_ip(map, map__start(map)));
return dso__find_symbol(map__dso(map), addr);
struct symbol *dso__find_symbol(struct dso *dso, u64 addr);