While creating snapshots do not write out fields of an empty context and while reading do not creat…

runtime/vm/object.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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 1524 matching lines @@
   cls = Class::New<Stacktrace>();
   cls = Class::New<JSRegExp>();
   cls = Class::New<Number>();
 
   cls = Class::New<WeakProperty>();
   object_store->set_weak_property_class(cls);
 
   cls = Class::New<MirrorReference>();
   cls = Class::New<UserTag>();
 
+  const Context& context = Context::Handle(isolate,
+                                           Context::New(0, Heap::kOld));
+  object_store->set_empty_context(context);
+
   StubCode::InitBootstrapStubs(isolate);
 }
 
 
 void Object::Print() const {
   OS::Print("%s\n", ToCString());
 }
 
 
 static void AddNameProperties(JSONObject* jsobj,
@@ skipping 19193 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart