Fix external allocated memory accounting to use 64 bit values on

src/heap-inl.h

Index: src/heap-inl.h
===================================================================
--- src/heap-inl.h	(revision 11259)
+++ src/heap-inl.h	(working copy)
@@ -460,15 +460,16 @@
 }
 
 
-int Heap::AdjustAmountOfExternalAllocatedMemory(int change_in_bytes) {
+intptr_t Heap::AdjustAmountOfExternalAllocatedMemory(
+    intptr_t change_in_bytes) {
   ASSERT(HasBeenSetUp());
-  int amount = amount_of_external_allocated_memory_ + change_in_bytes;
+  intptr_t amount = amount_of_external_allocated_memory_ + change_in_bytes;
   if (change_in_bytes >= 0) {
     // Avoid overflow.
     if (amount > amount_of_external_allocated_memory_) {
       amount_of_external_allocated_memory_ = amount;
     }
-    int amount_since_last_global_gc =
+    intptr_t amount_since_last_global_gc =
         amount_of_external_allocated_memory_ -
         amount_of_external_allocated_memory_at_last_global_gc_;
     if (amount_since_last_global_gc > external_allocation_limit_) {