Fix compile errors on 64 bit platforms.

src/heap.h

 // Copyright 2012 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 1308 matching lines @@
 
   // Attempt to find the number in a small cache.  If we finds it, return
   // the string representation of the number.  Otherwise return undefined.
   Object* GetNumberStringCache(Object* number);
 
   // Update the cache with a new number-string pair.
   void SetNumberStringCache(Object* number, String* str);
 
   // Adjusts the amount of registered external memory.
   // Returns the adjusted value.
-  inline int AdjustAmountOfExternalAllocatedMemory(int change_in_bytes);
+  inline intptr_t AdjustAmountOfExternalAllocatedMemory(
+      intptr_t change_in_bytes);
 
   // Allocate uninitialized fixed array.
   MUST_USE_RESULT MaybeObject* AllocateRawFixedArray(int length);
   MUST_USE_RESULT MaybeObject* AllocateRawFixedArray(int length,
                                                      PretenureFlag pretenure);
 
   inline intptr_t PromotedTotalSize() {
     return PromotedSpaceSize() + PromotedExternalMemorySize();
   }
 
@@ skipping 299 matching lines @@
   OldSpace* old_pointer_space_;
   OldSpace* old_data_space_;
   OldSpace* code_space_;
   MapSpace* map_space_;
   CellSpace* cell_space_;
   LargeObjectSpace* lo_space_;
   HeapState gc_state_;
   int gc_post_processing_depth_;
 
   // Returns the amount of external memory registered since last global gc.
-  int PromotedExternalMemorySize();
+  intptr_t PromotedExternalMemorySize();
 
   int ms_count_;  // how many mark-sweep collections happened
   unsigned int gc_count_;  // how many gc happened
 
   // For post mortem debugging.
   static const int kRememberedUnmappedPages = 128;
   int remembered_unmapped_pages_index_;
   Address remembered_unmapped_pages_[kRememberedUnmappedPages];
 
   // Total length of the strings we failed to flatten since the last GC.
@@ skipping 47 matching lines @@
 
   // Limit on the amount of externally allocated memory allowed
   // between global GCs. If reached a global GC is forced.
   intptr_t external_allocation_limit_;
 
   // The amount of external memory registered through the API kept alive
   // by global handles
   intptr_t amount_of_external_allocated_memory_;
 
   // Caches the amount of external memory registered at the last global gc.
-  int amount_of_external_allocated_memory_at_last_global_gc_;
+  intptr_t amount_of_external_allocated_memory_at_last_global_gc_;
 
   // Indicates that an allocation has failed in the old generation since the
   // last GC.
   int old_gen_exhausted_;
 
   Object* roots_[kRootListLength];
 
   Object* global_contexts_list_;
 
   StoreBufferRebuilder store_buffer_rebuilder_;
@@ skipping 978 matching lines @@
   AssertNoAllocation no_alloc;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG || LIVE_OBJECT_LIST
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_