protected void addOverlaySpace(ProgramOverlayAddressSpace ovSpace)
			throws DuplicateNameException {
		if (!ovSpace.getOrderedKey().equals(ovSpace.getName())) {
			hasStaleOverlays = true;
		}
		addAddressSpace(ovSpace);
	}
Add an overlay address space to this factory
@param ovSpace overlay space
@throws DuplicateNameException if name of overlay space already exists in this factory
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/ProgramAddressFactory.java