Method ~TaskMeta

src/bthread/task_meta.h:133–138

    }
        
    ~TaskMeta() {
        pthread_mutex_destroy(&trace_lock);
        butex_destroy(version_butex);
        version_butex = NULL;
        pthread_spin_destroy(&version_lock);
    }

    void set_stack(ContextualStack* s) {
        stack = s;