[KV]: replace priority_queue with dequeue.
[KV]: replace priority_queue with dequeue.

zheng-da/FlashX,silky/FlashGraph,flashxio/FlashX,zheng-da/FlashX,icoming/FlashX,flashxio/FlashX,icoming/FlashGraph,icoming/FlashGraph,silky/FlashGraph,silky/FlashGraph,icoming/FlashGraph,icoming/FlashX,icoming/FlashX,zheng-da/FlashX,silky/FlashGraph,flashxio/FlashX,zheng-da/FlashX,icoming/FlashX,icoming/FlashGraph,icoming/FlashX,flashxio/FlashX,flashxio/FlashX,zheng-da/FlashX,icoming/FlashGraph,silky/FlashGraph,flashxio/FlashX