删除根节点，内存占用不释放

[liushuo1024]

Delete_Storage_Disabled = true;
delete_tree_nodes(&Root_Node);
PointVector ().swap(PCL_Storage);
Rebuild_Logger.clear();

[liushuo1024]

Delete_Storage_Disabled = true;
delete_tree_nodes(&Root_Node);
PointVector ().swap(PCL_Storage);
Rebuild_Logger.clear();

   可解决
    // 尝试释放内存给操作系统
    if (malloc_trim(0) == 0) {
        std::cout << "Memory successfully trimmed." << std::endl;
    } else {
        std::cout << "Memory trim failed." << std::endl;
    }