Remove support for object grouping during Garbage Collection

runtime/vm/object_graph.cc

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/object_graph.h"
 
 #include "vm/dart.h"
 #include "vm/growable_array.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
@@ skipping 155 matching lines @@
 
 
 ObjectGraph::~ObjectGraph() {
   isolate()->heap()->WriteProtectCode(true);
 }
 
 
 void ObjectGraph::IterateObjects(ObjectGraph::Visitor* visitor) {
   NoSafepointScope no_safepoint_scope_;
   Stack stack(isolate());
-  isolate()->IterateObjectPointers(&stack, false, false);
+  isolate()->IterateObjectPointers(&stack, false);
   stack.TraverseGraph(visitor);
   Unmarker::UnmarkAll(isolate());
 }
 
 
 void ObjectGraph::IterateObjectsFrom(const Object& root,
                                      ObjectGraph::Visitor* visitor) {
   NoSafepointScope no_safepoint_scope_;
   Stack stack(isolate());
   RawObject* root_raw = root.raw();
@@ skipping 279 matching lines @@
 intptr_t ObjectGraph::Serialize(WriteStream* stream) {
   // Current encoding assumes objects do not move, so promote everything to old.
   isolate()->heap()->new_space()->Evacuate();
   WriteGraphVisitor visitor(isolate(), stream);
   stream->WriteUnsigned(kObjectAlignment);
   stream->WriteUnsigned(0);
   stream->WriteUnsigned(0);
   stream->WriteUnsigned(0);
   {
     WritePointerVisitor ptr_writer(isolate(), stream);
-    isolate()->IterateObjectPointers(&ptr_writer, false, false);
+    isolate()->IterateObjectPointers(&ptr_writer, false);
   }
   stream->WriteUnsigned(0);
   IterateObjects(&visitor);
   return visitor.count() + 1;  // + root
 }
 
 }  // namespace dart