Support large objects in the serializer/deserializer.

src/snapshot.h

Index: src/snapshot.h
diff --git a/src/snapshot.h b/src/snapshot.h
index 3d752a72aa745f1f57a2aaee6d637645617743bf..590ecf17180706b848f53e992d9a0652e298aa34 100644
--- a/src/snapshot.h
+++ b/src/snapshot.h
@@ -48,6 +48,7 @@ class Snapshot {
   static const int map_space_used_;
   static const int cell_space_used_;
   static const int property_cell_space_used_;
+  static const int lo_space_used_;
   static const int context_new_space_used_;
   static const int context_pointer_space_used_;
   static const int context_data_space_used_;
@@ -55,6 +56,7 @@ class Snapshot {
   static const int context_map_space_used_;
   static const int context_cell_space_used_;
   static const int context_property_cell_space_used_;
+  static const int context_lo_space_used_;
   static const int size_;
   static const int raw_size_;
   static const int context_size_;