Add a UpdatedGuardedCidBit to Class object so that we don't have

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 2945 matching lines @@
 void Class::set_is_mixin_app_alias() const {
   set_state_bits(MixinAppAliasBit::update(true, raw_ptr()->state_bits_));
 }
 
 
 void Class::set_is_mixin_type_applied() const {
   set_state_bits(MixinTypeAppliedBit::update(true, raw_ptr()->state_bits_));
 }
 
 
+void Class::set_is_fields_marked_nullable() const {
+  set_state_bits(FieldsMarkedNullableBit::update(true, raw_ptr()->state_bits_));
+}
+
+
 void Class::set_is_finalized() const {
   ASSERT(!is_finalized());
   set_state_bits(ClassFinalizedBits::update(RawClass::kFinalized,
                                             raw_ptr()->state_bits_));
 }
 
 
 void Class::set_is_prefinalized() const {
   ASSERT(!is_finalized());
   set_state_bits(ClassFinalizedBits::update(RawClass::kPreFinalized,
@@ skipping 14244 matching lines @@
   return "_MirrorReference";
 }
 
 
 void MirrorReference::PrintToJSONStream(JSONStream* stream, bool ref) const {
   Instance::PrintToJSONStream(stream, ref);
 }
 
 
 }  // namespace dart