public Varnode[] getInternalStorage() {
		if (internalstorage == null) {
			internalstorage = new Varnode[0];
		}
		return internalstorage;
	}
@return list of registers used to store internal compiler constants
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/lang/PrototypeModel.java