@Override
	public boolean isExternalBlockAddress(Address addr) {
		MemoryAddressSetViews localAddrSetViews = buildAddressSets(false);
		return localAddrSetViews.externalBlock.contains(addr);
	}
Returns the AddressMap from the program.

@return program address map
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/mem/MemoryMapDB.java