public void addBlockFlow(InstructionBlockFlow blockFlow) {
		if (blockFlows == null) {
			blockFlows = new ArrayList<InstructionBlockFlow>();
		}
		blockFlows.add(blockFlow);
	}
Add a block flow specified by a InstructionBlockFlow object.  These flows include all
calls, branches and fall-throughs and may span across multiple InstructionSets and are
not used by the block flow iterator within the associated InstructionSet.
@param blockFlow block flow
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/lang/InstructionBlock.java