map__find_symbol_by_name
sym = map__find_symbol_by_name(map, "foo");
sym = map__find_symbol_by_name(map, "bar");
sym = map__find_symbol_by_name(browser->map, target);
struct symbol *map__find_symbol_by_name(struct map *map, const char *name);
args->sym = map__find_symbol_by_name(map, args->name);