Fix the --max-old-space-size flag so it can be used on 64 bit for

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 76 matching lines @@
   // of at a moderate rate of work and gradually increase the speed of the
   // incremental marker until it completes.
   // Do some marking every time this much memory has been allocated.
   static const intptr_t kAllocatedThreshold = 8192;
   // Start off by marking this many times more memory than has been allocated.
   static const intptr_t kInitialAllocationMarkingFactor = 4;
   // After this many steps we increase the marking/allocating factor.
   static const intptr_t kAllocationMarkingFactorSpeedupInterval = 1024;
   // This is how much we increase the marking/allocating factor by.
   static const intptr_t kAllocationMarkingFactorSpeedup = 4;
+  static const intptr_t kMaxAllocationMarkingFactor = 1000000000;
 
   void Step(intptr_t allocated);
 
   inline void RestartIfNotMarking() {
     if (state_ == COMPLETE) {
       state_ = MARKING;
       if (FLAG_trace_incremental_marking) {
         PrintF("[IncrementalMarking] Restarting (new grey objects)\n");
       }
     }
@@ skipping 28 matching lines @@
   }
 
   inline int steps_count() {
     return steps_count_;
   }
 
   inline double steps_took() {
     return steps_took_;
   }
 
+  inline double longest_step() {
+    return longest_step_;
+  }
+
   inline int steps_count_since_last_gc() {
     return steps_count_since_last_gc_;
   }
 
   inline double steps_took_since_last_gc() {
     return steps_took_since_last_gc_;
   }
 
   inline void SetOldSpacePageFlags(MemoryChunk* chunk) {
     SetOldSpacePageFlags(chunk, IsMarking());
@@ skipping 10 matching lines @@
   void ActivateGeneratedStub(Code* stub);
 
  private:
   void set_should_hurry(bool val) {
     should_hurry_ = val;
   }
 
   void ResetStepCounters() {
     steps_count_ = 0;
     steps_took_ = 0;
+    longest_step_ = 0.0;
     steps_count_since_last_gc_ = 0;
     steps_took_since_last_gc_ = 0;
+    bytes_rescanned_ = 0;
     allocation_marking_factor_ = kInitialAllocationMarkingFactor;
   }
 
   static void ClearMarkbits(PagedSpace* space);
   static void ClearMarkbits(NewSpace* space);
   void ClearMarkbits();
 
 #ifdef DEBUG
   void VerifyMarkbitsAreClean();
   static void VerifyMarkbitsAreClean(PagedSpace* space);
@@ skipping 14 matching lines @@
   Heap* heap_;
 
   State state_;
   bool is_compacting_;
 
   VirtualMemory* marking_deque_memory_;
   MarkingDeque marking_deque_;
 
   int steps_count_;
   double steps_took_;
+  double longest_step_;
   int steps_count_since_last_gc_;
   double steps_took_since_last_gc_;
+  int64_t bytes_rescanned_;
   bool should_hurry_;
   int allocation_marking_factor_;
   intptr_t allocated_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(IncrementalMarking);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_INCREMENTAL_MARKING_H_