Introduce subclass wrappers for STL containers that make them a lot easier

src/compiler/scheduler.cc

Index: src/compiler/scheduler.cc
diff --git a/src/compiler/scheduler.cc b/src/compiler/scheduler.cc
index d32a70750fdc2bbb1f3e51af171c3a5efa1af028..bdca6b4f2bfa9bf99ecbf3575b2b31bd13d7b9d1 100644
--- a/src/compiler/scheduler.cc
+++ b/src/compiler/scheduler.cc
@@ -207,10 +207,10 @@ Scheduler::Scheduler(Zone* zone, Graph* graph, Schedule* schedule)
     : zone_(zone),
       graph_(graph),
       schedule_(schedule),
-      unscheduled_uses_(IntVector::allocator_type(zone)),
-      scheduled_nodes_(NodeVectorVector::allocator_type(zone)),
-      schedule_root_nodes_(NodeVector::allocator_type(zone)),
-      schedule_early_rpo_index_(IntVector::allocator_type(zone)) {}
+      unscheduled_uses_(zone),
+      scheduled_nodes_(zone),
+      schedule_root_nodes_(zone),
+      schedule_early_rpo_index_(zone) {}
 
 
 Schedule* Scheduler::ComputeSchedule(Graph* graph) {
@@ -273,8 +273,7 @@ void Scheduler::PrepareAuxiliaryNodeData() {
 
 void Scheduler::PrepareAuxiliaryBlockData() {
   Zone* zone = schedule_->zone();
-  scheduled_nodes_.resize(schedule_->BasicBlockCount(),
-                          NodeVector(NodeVector::allocator_type(zone)));
+  scheduled_nodes_.resize(schedule_->BasicBlockCount(), NodeVector(zone));
   schedule_->immediate_dominator_.resize(schedule_->BasicBlockCount(), NULL);
 }