@Override
	public boolean hasValue(Register register) {
		BigInteger value = getValue(register, true);
		return value != null;
	}
Saves the context from the startAddr (inclusive) to the end address (inclusive)
back to the program's stored context.
@param startAddress 
@param endAddress
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/disassemble/DisassemblerContextImpl.java