@Override
	public synchronized AddressSetView getRegisterAddressSet() {
		SynchronizedAddressSetCollection addressSetCollection =
			new SynchronizedAddressSetCollection(this, changedRegAddrsSinceCheckout,
				changedRegAddrsSinceSave, tmpRegAddrs);
		return addressSetCollection.getCombinedAddressSet();
	}
Construct a new ProgramChangeSet.
@param addrMap the address map.
@param numUndos the number of undo change sets to track.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/ProgramDBChangeSet.java