[serializer] prepare attached references for general use.

src/context-measure.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/context-measure.h"
 
 #include "src/base/logging.h"
 #include "src/contexts.h"
 #include "src/objects-inl.h"
 
@@ skipping 19 matching lines @@
   if (object->IsSharedFunctionInfo()) return true;
   if (object->IsScopeInfo()) return true;
   if (object->IsCode() && !Code::cast(object)->is_optimized_code()) return true;
   if (object->IsAccessorInfo()) return true;
   if (object->IsWeakCell()) return true;
   return false;
 }
 
 
 void ContextMeasure::MeasureObject(HeapObject* object) {
-  if (back_reference_map_.Lookup(object).is_valid()) return;
+  if (reference_map_.Lookup(object).is_valid()) return;
   if (root_index_map_.Lookup(object) != RootIndexMap::kInvalidRootIndex) return;
   if (IsShared(object)) return;
-  back_reference_map_.Add(object, BackReference::DummyReference());
+  reference_map_.Add(object, SerializerReference::DummyReference());
   recursion_depth_++;
   if (recursion_depth_ > kMaxRecursion) {
     deferred_objects_.Add(object);
   } else {
     MeasureAndRecurse(object);
   }
   recursion_depth_--;
 }
 
 
@@ skipping 15 matching lines @@
 
 
 void ContextMeasure::VisitPointers(Object** start, Object** end) {
   for (Object** current = start; current < end; current++) {
     if ((*current)->IsSmi()) continue;
     MeasureObject(HeapObject::cast(*current));
   }
 }
 }  // namespace internal
 }  // namespace v8