public Set<Varnode> getReturnValues(Varnode varnode) {
		HashSet<Varnode> valueSet = new HashSet<Varnode>();
		for (List<ContextState> endStateList : endStateMap.values()) {
			for (ContextState state : endStateList) {
				Varnode val = state.get(varnode);
				if (val != null) {
					valueSet.add(val);
				}
			}
		}
		return valueSet;
	}
@return Varnode that represents the stack pointer register
Ghidra/Features/Base/src/main/java/ghidra/util/state/ResultsState.java