Fix Win64 compile error caused by r12272.

src/extensions/statistics-extension.cc

 // 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 33 matching lines @@
 static void AddCounter(v8::Local<v8::Object> object,
                        StatsCounter* counter,
                        const char* name) {
   if (counter->Enabled()) {
     object->Set(v8::String::New(name),
                 v8::Number::New(*counter->GetInternalPointer()));
   }
 }
 
 static void AddNumber(v8::Local<v8::Object> object,
-                      double value,
+                      intptr_t value,
                       const char* name) {
-  object->Set(v8::String::New(name), v8::Number::New(value));
+  object->Set(v8::String::New(name),
+              v8::Number::New(static_cast<double>(value)));
 }
 
 
 v8::Handle<v8::Value> StatisticsExtension::GetCounters(
     const v8::Arguments& args) {
   Isolate* isolate = Isolate::Current();
   Heap* heap = isolate->heap();
 
   if (args.Length() > 0) {  // GC if first argument evaluates to true.
     if (args[0]->IsBoolean() && args[0]->ToBoolean()->Value()) {
@@ skipping 76 matching lines @@
   return result;
 }
 
 
 void StatisticsExtension::Register() {
   static StatisticsExtension statistics_extension;
   static v8::DeclareExtension declaration(&statistics_extension);
 }
 
 } }  // namespace v8::internal