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

src/heap.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 342 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ExternalStringTable);
 };
 
 
 class Heap {
  public:
   // Configure heap size before setup. Return false if the heap has been
   // setup already.
   bool ConfigureHeap(int max_semispace_size,
-                     int max_old_gen_size,
-                     int max_executable_size);
+                     intptr_t max_old_gen_size,
+                     intptr_t max_executable_size);
   bool ConfigureHeapDefault();
 
   // Initializes the global object heap. If create_heap_objects is true,
   // also creates the basic non-mutable objects.
   // Returns whether it succeeded.
   bool Setup(bool create_heap_objects);
 
   // Destroys all memory allocated by the heap.
   void TearDown();
 
@@ skipping 1817 matching lines @@
   // Amount of time spent in mutator that is time elapsed between end of the
   // previous collection and the beginning of the current one.
   double spent_in_mutator_;
 
   // Size of objects promoted during the current collection.
   intptr_t promoted_objects_size_;
 
   // Incremental marking steps counters.
   int steps_count_;
   double steps_took_;
+  double longest_step_;
   int steps_count_since_last_gc_;
   double steps_took_since_last_gc_;
 
   Heap* heap_;
 };
 
 
 class TranscendentalCache {
  public:
   enum Type {ACOS, ASIN, ATAN, COS, EXP, LOG, SIN, TAN, kNumberOfCaches};
@@ skipping 173 matching lines @@
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG || LIVE_OBJECT_LIST
 
 } }  // namespace v8::internal
 
 #undef HEAP
 
 #endif  // V8_HEAP_H_