Add a first class GrowableObjectArray type in the VM and use it internally in the VM at all spots w…

vm/raw_object.cc

Index: vm/raw_object.cc
===================================================================
--- vm/raw_object.cc	(revision 5060)
+++ vm/raw_object.cc	(working copy)
@@ -591,6 +591,13 @@
 }
 
 
+intptr_t RawGrowableObjectArray::VisitGrowableObjectArrayPointers(
+    RawGrowableObjectArray* raw_obj, ObjectPointerVisitor* visitor) {
+  visitor->VisitPointers(raw_obj->from(), raw_obj->to());
+  return GrowableObjectArray::InstanceSize();
+}
+
+
 intptr_t RawByteArray::VisitByteArrayPointers(RawByteArray* raw_obj,
                                               ObjectPointerVisitor* visitor) {
   // ByteArray is an abstract class.