@Override
	public RegisterValue getNonDefaultValue(Register register, Address address) {
		return getRegisterValue(register, address, registerValueMap);
	}
if the address is in an overlay and we are getting the default value, then get the default
value from the base space, not the overlay space.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/util/AbstractStoredProgramContext.java