[heap] Only visit strong links during scavenge of promoted objects

src/heap/heap.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_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 #include <map>
 
@@ skipping 1133 matching lines @@
   void IterateRoots(ObjectVisitor* v, VisitMode mode);
   // Iterates over all strong roots in the heap.
   void IterateStrongRoots(ObjectVisitor* v, VisitMode mode);
   // Iterates over entries in the smi roots list.  Only interesting to the
   // serializer/deserializer, since GC does not care about smis.
   void IterateSmiRoots(ObjectVisitor* v);
   // Iterates over all the other roots in the heap.
   void IterateWeakRoots(ObjectVisitor* v, VisitMode mode);
 
   // Iterate pointers of promoted objects.
-  void IteratePromotedObject(HeapObject* target, int size,
-                             bool was_marked_black,
-                             ObjectSlotCallback callback);
-
-  void IteratePromotedObjectPointers(HeapObject* object, Address start,
-                                     Address end, bool record_slots,
-                                     ObjectSlotCallback callback);
+  void IterateAndScavengePromotedObject(HeapObject* target, int size,
+                                        bool was_marked_black);
 
   // ===========================================================================
   // Store buffer API. =========================================================
   // ===========================================================================
 
   // Write barrier support for object[offset] = o;
   inline void RecordWrite(Object* object, int offset, Object* o);
   inline void RecordWriteIntoCode(Code* host, RelocInfo* rinfo, Object* target);
   void RecordWriteIntoCodeSlow(Code* host, RelocInfo* rinfo, Object* target);
   void RecordWritesIntoCode(Code* code);
@@ skipping 1158 matching lines @@
   bool delay_sweeper_tasks_for_testing_;
 
   // Classes in "heap" can be friends.
   friend class AlwaysAllocateScope;
   friend class GCCallbacksScope;
   friend class GCTracer;
   friend class HeapIterator;
   friend class IdleScavengeObserver;
   friend class IncrementalMarking;
   friend class IncrementalMarkingJob;
-  friend class IteratePromotedObjectsVisitor;
   friend class LargeObjectSpace;
   friend class MarkCompactCollector;
   friend class MarkCompactMarkingVisitor;
   friend class NewSpace;
   friend class ObjectStatsCollector;
   friend class Page;
   friend class PagedSpace;
   friend class Scavenger;
   friend class StoreBuffer;
   friend class TestMemoryAllocatorScope;
@@ skipping 292 matching lines @@
   friend class LargeObjectSpace;
   friend class NewSpace;
   friend class PagedSpace;
   DISALLOW_COPY_AND_ASSIGN(AllocationObserver);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_H_