Fix x64 compilation

runtime/bin/thread_pool_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/thread_pool.h"
 #include "bin/thread.h"
 #include "platform/assert.h"
 #include "platform/globals.h"
 #include "vm/unit_test.h"
 
 
 UNIT_TEST_CASE(ThreadPoolStartStop) {
   ThreadPool thread_pool(NULL, 10);
   thread_pool.Start();
   thread_pool.Shutdown();
 }
 
 
 static dart::Monitor* monitor = NULL;
 static uint32_t task_count = 0;
 static uint32_t task_sum = 0;
 
 
 void TestTaskHandler(ThreadPool::Task args) {
   MonitorLocker ml(monitor);
   task_count++;
-  task_sum += reinterpret_cast<int>(args);
+  task_sum += reinterpret_cast<intptr_t>(args);
 }
 
 
 UNIT_TEST_CASE(ThreadPoolTest1) {
   static const uint32_t kNumTestThreads = 10;
   static const uint32_t kNumTestTasks = 1000;
   static const uint32_t kNumLoops = 100;
   monitor = new dart::Monitor();
   ThreadPool thread_pool(&TestTaskHandler, kNumTestThreads);
   uint32_t pool_start_count = 0;
@@ skipping 41 matching lines @@
   thread_pool.Start();
   thread_pool.Shutdown(ThreadPool::kDrain);
 
   // Check that all tasks where processed.
   EXPECT_EQ(kNumTestTasks, task_count);
   EXPECT_EQ((1 + kNumTestTasks) * (kNumTestTasks / 2), task_sum);
 
   delete monitor;
   monitor = NULL;
 }