Function ready_to_run_from_timer_thread

src/bthread/task_group.cpp:955–961

};

static void ready_to_run_from_timer_thread(void* arg) {
    CHECK(tls_task_group == NULL);
    const SleepArgs* e = static_cast<const SleepArgs*>(arg);
    auto g = e->group;
    auto tag = g->tag();
    g->control()->choose_one_group(tag)->ready_to_run_remote(e->meta);
}

void TaskGroup::_add_sleep_event(void* void_args) {
    // Must copy SleepArgs. After calling TimerThread::schedule(), previous