185   std::deque<Instruction*> Worklist(Roots.begin(), Roots.end());  in walkBackwards()  local
186   while (!Worklist.empty()) {  in walkBackwards()
187     Instruction *I = Worklist.back();  in walkBackwards()
188     Worklist.pop_back();  in walkBackwards()
228           Worklist.push_back(OI);  in walkBackwards()
329   std::deque<Instruction *> Worklist;  in walkForwards()  local
332       Worklist.push_back(Pair.first);  in walkForwards()
334   while (!Worklist.empty()) {  in walkForwards()
335     Instruction *I = Worklist.back();  in walkForwards()
336     Worklist.pop_back();  in walkForwards()
341       Worklist.push_front(I); // Reprocess later.  in walkForwards()