Fix Win64 build breakage in r12082.

src/heap.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 7198 matching lines @@
   }
 }
 
 
 static LazyMutex checkpoint_object_stats_mutex = LAZY_MUTEX_INITIALIZER;
 
 
 void Heap::CheckpointObjectStats() {
   ScopedLock lock(checkpoint_object_stats_mutex.Pointer());
   Counters* counters = isolate()->counters();
-#define ADJUST_LAST_TIME_OBJECT_COUNT(name) \
-  counters->count_of_##name()->Increment(object_counts_[name]); \
-  counters->count_of_##name()->Decrement(object_counts_last_time_[name]); \
-  counters->size_of_##name()->Increment(object_sizes_[name]); \
-  counters->size_of_##name()->Decrement(object_sizes_last_time_[name]);
+#define ADJUST_LAST_TIME_OBJECT_COUNT(name)                                    \
+  counters->count_of_##name()->Increment(                                      \
+      static_cast<int>(object_counts_[name]));                                 \
+  counters->count_of_##name()->Decrement(                                      \
+      static_cast<int>(object_counts_last_time_[name]));                       \
+  counters->size_of_##name()->Increment(                                       \
+      static_cast<int>(object_sizes_[name]));                                  \
+  counters->size_of_##name()->Decrement(                                       \
+      static_cast<int>(object_sizes_last_time_[name]));
   INSTANCE_TYPE_LIST(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
-  memcpy(object_counts_last_time_, object_counts_,
-         sizeof(object_counts_));
-  memcpy(object_sizes_last_time_, object_sizes_,
-         sizeof(object_sizes_));
+  memcpy(object_counts_last_time_, object_counts_, sizeof(object_counts_));
+  memcpy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_));
   ClearObjectStats();
 }
 
 } }  // namespace v8::internal