Change trail from GrowableObjectArray to ZoneGrowableArray.

runtime/vm/class_finalizer.h

 // 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.
 
 #ifndef VM_CLASS_FINALIZER_H_
 #define VM_CLASS_FINALIZER_H_
 
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
 
@@ skipping 126 matching lines @@
       const GrowableObjectArray& cloned_funcs);
   static void CollectTypeArguments(const Class& cls,
                                    const Type& type,
                                    const GrowableObjectArray& collected_args);
   static RawType* ResolveMixinAppType(const Class& cls,
                                       const MixinAppType& mixin_app_type);
   static void ResolveSuperTypeAndInterfaces(const Class& cls,
                                             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);
   static void CheckTypeBounds(const Class& cls, const Type& type);
   static void CheckTypeArgumentBounds(const Class& cls,
                                       const TypeArguments& arguments,
                                       Error* bound_error);
   static void ResolveUpperBounds(const Class& cls);
   static void FinalizeUpperBounds(const Class& cls);
   static void ResolveAndFinalizeSignature(const Class& cls,
@@ skipping 17 matching lines @@
                            const char* format, ...) PRINTF_ATTRIBUTE(4, 5);
 
   // Verify implicit offsets recorded in the VM for direct access to fields of
   // Dart instances (e.g: _TypedListView, _ByteDataView).
   static void VerifyImplicitFieldOffsets();
 };
 
 }  // namespace dart
 
 #endif  // VM_CLASS_FINALIZER_H_