Change trail from GrowableObjectArray to ZoneGrowableArray.

runtime/vm/class_finalizer.h

Index: runtime/vm/class_finalizer.h
diff --git a/runtime/vm/class_finalizer.h b/runtime/vm/class_finalizer.h
index de8cdde95c6c2bec2a00d9759b748da3217f0dfd..9d91e0cc98ba7cecab637557107ce6518e5ced23 100644
--- a/runtime/vm/class_finalizer.h
+++ b/runtime/vm/class_finalizer.h
@@ -144,12 +144,13 @@ class ClassFinalizer : public AllStatic {
                                             GrowableArray<intptr_t>* visited);
   static void FinalizeTypeParameters(const Class& cls,
                                      GrowableObjectArray* pending_types = NULL);
-  static void FinalizeTypeArguments(const Class& cls,
-                                    const TypeArguments& arguments,
-                                    intptr_t num_uninitialized_arguments,
-                                    Error* bound_error,
-                                    GrowableObjectArray* pending_types,
-                                    GrowableObjectArray* trail);
+  static void FinalizeTypeArguments(
+      const Class& cls,
+      const TypeArguments& arguments,
+      intptr_t num_uninitialized_arguments,
+      Error* bound_error,
+      GrowableObjectArray* pending_types,

[regis, 2015/08/27 02:30:25]

Will you do it next for pending_types?

[srdjan, 2015/08/27 16:09:49]

Maybe. The priority is to fix issues for background compilation first
(allocating in new space while optimizing). I would also like to give it more
thought how to make A ZoneGrowableArray of handles safer to use (elements must
be unique zone handles).

+      ZoneGrowableArray<const Instance*>* trail);
   static void CheckRecursiveType(const Class& cls,
                                  const Type& type,
                                  GrowableObjectArray* pending_types);