Complete implementation of bounds checking in the vm, by introducing a vm object

runtime/vm/raw_object.cc

Index: runtime/vm/raw_object.cc
===================================================================
--- runtime/vm/raw_object.cc	(revision 19513)
+++ runtime/vm/raw_object.cc	(working copy)
@@ -356,6 +356,13 @@
 }
 
 
+intptr_t RawBoundedType::VisitBoundedTypePointers(
+    RawBoundedType* raw_obj, ObjectPointerVisitor* visitor) {
+  visitor->VisitPointers(raw_obj->from(), raw_obj->to());
+  return BoundedType::InstanceSize();
+}
+
+
 intptr_t RawAbstractTypeArguments::VisitAbstractTypeArgumentsPointers(
     RawAbstractTypeArguments* raw_obj, ObjectPointerVisitor* visitor) {
   // RawAbstractTypeArguments is an abstract class.