Visit encountered JSWeakCollection list during scavenging.

src/objects-visiting-inl.h

 // Copyright 2012 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.
 
 #ifndef V8_OBJECTS_VISITING_INL_H_
 #define V8_OBJECTS_VISITING_INL_H_
 
 
 namespace v8 {
 namespace internal {
@@ skipping 384 matching lines @@
       HeapObject::RawField(object, AllocationSite::kPointerFieldsEndOffset));
 }
 
 
 template<typename StaticVisitor>
 void StaticMarkingVisitor<StaticVisitor>::VisitWeakCollection(
     Map* map, HeapObject* object) {
   Heap* heap = map->GetHeap();
   JSWeakCollection* weak_collection =
       reinterpret_cast<JSWeakCollection*>(object);
-  MarkCompactCollector* collector = heap->mark_compact_collector();
 
   // Enqueue weak collection in linked list of encountered weak collections.
   if (weak_collection->next() == heap->undefined_value()) {
-    weak_collection->set_next(collector->encountered_weak_collections());
-    collector->set_encountered_weak_collections(weak_collection);
+    weak_collection->set_next(heap->encountered_weak_collections());
+    heap->set_encountered_weak_collections(weak_collection);
   }
 
   // Skip visiting the backing hash table containing the mappings and the
   // pointer to the other enqueued weak collections, both are post-processed.
   StaticVisitor::VisitPointers(heap,
       HeapObject::RawField(object, JSWeakCollection::kPropertiesOffset),
       HeapObject::RawField(object, JSWeakCollection::kTableOffset));
   STATIC_ASSERT(JSWeakCollection::kTableOffset + kPointerSize ==
       JSWeakCollection::kNextOffset);
   STATIC_ASSERT(JSWeakCollection::kNextOffset + kPointerSize ==
@@ skipping 539 matching lines @@
   RelocIterator it(this, mode_mask);
   for (; !it.done(); it.next()) {
     it.rinfo()->template Visit<StaticVisitor>(heap);
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_VISITING_INL_H_