Move Null class out of the VM isolate.

runtime/vm/object_store.cc

 // Copyright (c) 2013, 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/object_store.h"
 
 #include "vm/exceptions.h"
 #include "vm/dart_entry.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/raw_object.h"
 #include "vm/symbols.h"
 #include "vm/visitor.h"
 
 namespace dart {
 
 ObjectStore::ObjectStore()
   : object_class_(Class::null()),
     object_type_(Type::null()),
+    null_class_(Class::null()),
     null_type_(Type::null()),
     dynamic_type_(Type::null()),
     void_type_(Type::null()),
     function_type_(Type::null()),
     type_class_(Class::null()),
     number_type_(Type::null()),
     int_type_(Type::null()),
     integer_implementation_class_(Class::null()),
     smi_class_(Class::null()),
     mint_class_(Class::null()),
@@ skipping 114 matching lines @@
 void ObjectStore::InitKeywordTable() {
   // Set up the keywords symbol array so that we can access it while scanning.
   Array& keywords = Array::Handle(keyword_symbols());
   ASSERT(keywords.IsNull());
   keywords = Array::New(Token::numKeywords, Heap::kOld);
   ASSERT(!keywords.IsError() && !keywords.IsNull());
   set_keyword_symbols(keywords);
 }
 
 }  // namespace dart