public AddressSet getFlowToAddressSet(TaskMonitor monitor) {
		return getAddressFlow(monitor, initialAddresses, false);
	}
Determines the address set that flows to the addresses in this FollowFlow object's
initialAddresses set. The address set is determined by what addresses were provided 
when the FollowFlow was constructed and the type of flow requested. The constructor
indicated the flow types not to be followed. All others will be traversed in the
backwards direction to determine the addresses that are flowing to those in the initial
set.
@param monitor a cancellable task monitor, may be null
@return code unit flow represented by an address set as determined by the flow options.
An empty address set will be returned if cancelled.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/block/FollowFlow.java