void addToCheckpoint(BufferNode checkpointHead) {
		prevInCheckpoint = checkpointHead;
		nextInCheckpoint = checkpointHead.nextInCheckpoint;
		checkpointHead.nextInCheckpoint.prevInCheckpoint = this;
		checkpointHead.nextInCheckpoint = this;	
	}
Link this node to the top of the Checkpoint list.
@param checkpointHead
Ghidra/Framework/DB/src/main/java/db/buffers/BufferNode.java