Merge initial implementation of deferred handling in the VM:

runtime/vm/snapshot.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 "vm/snapshot.h"
 
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
 #include "vm/bootstrap.h"
 #include "vm/class_finalizer.h"
@@ skipping 580 matching lines @@
   ALLOC_NEW_OBJECT(Field, Object::field_class());
 }
 
 
 RawLibrary* SnapshotReader::NewLibrary() {
   ALLOC_NEW_OBJECT(Library, Object::library_class());
 }
 
 
 RawLibraryPrefix* SnapshotReader::NewLibraryPrefix() {
-  ALLOC_NEW_OBJECT(LibraryPrefix, Object::library_prefix_class());
+  ALLOC_NEW_OBJECT(LibraryPrefix, object_store()->library_prefix_class());
 }
 
 
 RawNamespace* SnapshotReader::NewNamespace() {
   ALLOC_NEW_OBJECT(Namespace, Object::namespace_class());
 }
 
 
 RawScript* SnapshotReader::NewScript() {
   ALLOC_NEW_OBJECT(Script, Object::script_class());
@@ skipping 948 matching lines @@
     NoGCScope no_gc;
     WriteObject(obj.raw());
     UnmarkAll();
   } else {
     ThrowException(exception_type(), exception_msg());
   }
 }
 
 
 }  // namespace dart