Fix external allocated memory accounting to use 64 bit values on

include/v8.h

Index: include/v8.h
===================================================================
--- include/v8.h	(revision 11259)
+++ include/v8.h	(working copy)
@@ -1236,8 +1236,7 @@
    * this function should not otherwise delete or modify the resource. Neither
    * should the underlying buffer be deallocated or modified except through the
    * destructor of the external string resource.
-   */
-  V8EXPORT static Local<String> NewExternal(
+   */ V8EXPORT static Local<String> NewExternal(
       ExternalAsciiStringResource* resource);
 
   /**
@@ -3153,7 +3152,8 @@
    *   that is kept alive by JavaScript objects.
    * \returns the adjusted value.
    */
-  static int AdjustAmountOfExternalAllocatedMemory(int change_in_bytes);
+  static intptr_t AdjustAmountOfExternalAllocatedMemory(
+      intptr_t change_in_bytes);
 
   /**
    * Suspends recording of tick samples in the profiler.