@Override
	public int compareTo(FunctionNode other) {
		return addr.compareTo(other.addr);	// Compare by address
	}
Allocate a container for FunctionNodes as needed by the NeighborGenerators.  These are generally small sets
where we need to check containment constantly.
@return the container
Ghidra/Features/VersionTrackingBSim/src/main/java/ghidra/feature/vt/api/FunctionNode.java