Do inline object filtering (via page flags) before call to RecordWriteStub.

src/incremental-marking.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 171 matching lines @@
   inline ObjectColor Color(HeapObject* obj);
 
   inline int steps_count() {
     return steps_count_;
   }
 
   inline double steps_took() {
     return steps_took_;
   }
 
+  inline void SetOldSpacePageFlags(MemoryChunk* chunk) {
+    SetOldSpacePageFlags(chunk, IsMarking());
+  }
+
+  inline void SetNewSpacePageFlags(MemoryChunk* chunk) {
+    SetNewSpacePageFlags(chunk, IsMarking());
+  }
+
+
  private:
   void set_should_hurry(bool val) {
     should_hurry_ = val;
   }
 
   void ResetStepCounters() {
     steps_count_ = 0;
     steps_took_ = 0;
     allocation_marking_factor_ = kInitialAllocationMarkingFactor;
   }
 
   static void ClearMarkbits(PagedSpace* space);
   void ClearMarkbits();
 
 #ifdef DEBUG
   void VerifyMarkbitsAreClean();
   static void VerifyMarkbitsAreClean(PagedSpace* space);
 #endif
 
   void StartMarking();
 
+  void RevertWriteBarrierFlags(PagedSpace* space);
+  void RevertWriteBarrierFlags();
+
+  static void SetOldSpacePageFlags(MemoryChunk* chunk, bool is_marking);
+  static void SetNewSpacePageFlags(MemoryChunk* chunk, bool is_marking);
 
   Heap* heap_;
 
   State state_;
   MarkingDeque marking_deque_;
 
   int steps_count_;
   double steps_took_;
   bool should_hurry_;
   intptr_t allocation_marking_factor_;
   intptr_t allocated_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_INCREMENTAL_MARKING_H_