VM: [Kernel] Cherry-pick from dart-lang/kernel_sdk

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index ccd7f25336eb8ac0355e8d39ec991b23466daed9..df005d27e56be6e09c2a9634f012050d6f58c5b9 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -545,6 +545,7 @@ void Object::InitOnce(Isolate* isolate) {
     cls.set_state_bits(0);
     cls.set_is_finalized();
     cls.set_is_type_finalized();
+    cls.set_is_cycle_free();
     cls.set_type_arguments_field_offset_in_words(Class::kNoTypeArguments);
     cls.set_num_type_arguments(0);
     cls.set_num_own_type_arguments(0);
@@ -565,6 +566,7 @@ void Object::InitOnce(Isolate* isolate) {
   cls.set_num_own_type_arguments(0);
   cls.set_is_finalized();
   cls.set_is_type_finalized();
+  cls.set_is_cycle_free();
 
   // Allocate and initialize the forwarding corpse class.
   cls = Class::New<ForwardingCorpse::FakeInstance>(kForwardingCorpse);
@@ -572,6 +574,7 @@ void Object::InitOnce(Isolate* isolate) {
   cls.set_num_own_type_arguments(0);
   cls.set_is_finalized();
   cls.set_is_type_finalized();
+  cls.set_is_cycle_free();
 
   // Allocate and initialize the sentinel values of Null class.
   {
@@ -824,20 +827,23 @@ void Object::InitOnce(Isolate* isolate) {
   cls.set_is_abstract();
   cls.set_num_type_arguments(0);
   cls.set_num_own_type_arguments(0);
-  cls.set_is_type_finalized();
   cls.set_is_finalized();
+  cls.set_is_type_finalized();
+  cls.set_is_cycle_free();
   dynamic_class_ = cls.raw();
 
   cls = Class::New<Instance>(kVoidCid);
   cls.set_num_type_arguments(0);
   cls.set_num_own_type_arguments(0);
-  cls.set_is_type_finalized();
   cls.set_is_finalized();
+  cls.set_is_type_finalized();
+  cls.set_is_cycle_free();
   void_class_ = cls.raw();
 
   cls = Class::New<Type>();
-  cls.set_is_type_finalized();
   cls.set_is_finalized();
+  cls.set_is_type_finalized();
+  cls.set_is_cycle_free();
 
   cls = dynamic_class_;
   *dynamic_type_ = Type::NewNonParameterizedType(cls);
@@ -3187,6 +3193,7 @@ RawClass* Class::NewNativeWrapper(const Library& library,
     cls.set_is_finalized();
     cls.set_is_type_finalized();
     cls.set_is_synthesized_class();
+    cls.set_is_cycle_free();
     library.AddClass(cls);
     return cls.raw();
   } else {