Fix compilation on 64-bit Windows

src/spaces.cc

 // Copyright 2006-2008 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 377 matching lines @@
   Counters::memory_allocated.Decrement(static_cast<int>(length));
   size_ -= static_cast<int>(length);
   if (executable == EXECUTABLE) size_executable_ -= static_cast<int>(length);
 
   ASSERT(size_ >= 0);
 }
 
 
 void MemoryAllocator::PerformAllocationCallback(ObjectSpace space,
                                                 AllocationAction action,
-                                                int size) {
+                                                size_t size) {
   for (int i = 0; i < memory_allocation_callbacks_.length(); ++i) {
     MemoryAllocationCallbackRegistration registration =
       memory_allocation_callbacks_[i];
     if ((registration.space & space) == space &&
         (registration.action & action) == action)
       registration.callback(space, action, static_cast<int>(size));
   }
 }
 
 
@@ skipping 2623 matching lines @@
   for (HeapObject* obj = obj_it.next(); obj != NULL; obj = obj_it.next()) {
     if (obj->IsCode()) {
       Code* code = Code::cast(obj);
       code_kind_statistics[code->kind()] += code->Size();
     }
   }
 }
 #endif  // DEBUG
 
 } }  // namespace v8::internal