[heap] Reland "Verify remembered set for objects in the old generation."

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 <vector>
 
@@ skipping 1517 matching lines @@
   // method needs to be called after evacuation, as allocation sites may be
   // evacuated and this method resolves forward pointers accordingly.
   void MergeAllocationSitePretenuringFeedback(
       const base::HashMap& local_pretenuring_feedback);
 
 // =============================================================================
 
 #ifdef VERIFY_HEAP
   // Verify the heap is in its normal state before or after a GC.
   void Verify();
+  void VerifyRememberedSetFor(HeapObject* object);
 #endif
 
 #ifdef DEBUG
   void set_allocation_timeout(int timeout) { allocation_timeout_ = timeout; }
 
   void Print();
   void PrintHandles();
 
   // Report heap statistics.
   void ReportHeapStatistics(const char* title);
@@ skipping 1107 matching lines @@
   friend class PagedSpace;
   DISALLOW_COPY_AND_ASSIGN(AllocationObserver);
 };
 
 V8_EXPORT_PRIVATE const char* AllocationSpaceName(AllocationSpace space);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_H_