Change trail from GrowableObjectArray to ZoneGrowableArray.

runtime/vm/class_finalizer.cc

 // Copyright (c) 2013, 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/class_finalizer.h"
 
 #include "vm/code_generator.h"
 #include "vm/flags.h"
 #include "vm/heap.h"
 #include "vm/isolate.h"
@@ skipping 637 matching lines @@
 // several type argument vectors may be mutually recursive and finalized at the
 // same time. Canonicalization happens when pending types are processed.
 // The trail is required to correctly instantiate a recursive type argument
 // of the super type.
 void ClassFinalizer::FinalizeTypeArguments(
     const Class& cls,
     const TypeArguments& arguments,
     intptr_t num_uninitialized_arguments,
     Error* bound_error,
     GrowableObjectArray* pending_types,
-    GrowableObjectArray* trail) {
+    TrailPtr trail) {
   ASSERT(arguments.Length() >= cls.NumTypeArguments());
   if (!cls.is_type_finalized()) {
     FinalizeTypeParameters(cls, pending_types);
     ResolveUpperBounds(cls);
   }
   AbstractType& super_type = AbstractType::Handle(cls.super_type());
   if (!super_type.IsNull()) {
     const Class& super_class = Class::Handle(super_type.type_class());
     const intptr_t num_super_type_params = super_class.NumTypeParameters();
     const intptr_t num_super_type_args = super_class.NumTypeArguments();
@@ skipping 416 matching lines @@
       Class& owner_class = Class::Handle(isolate);
       if (type_class.IsSignatureClass()) {
         const Function& signature_fun =
             Function::Handle(isolate, type_class.signature_function());
         ASSERT(!signature_fun.is_static());
         owner_class = signature_fun.Owner();
       } else {
         owner_class = type_class.raw();
       }
       if (offset > 0) {
-        GrowableObjectArray& trail =
-            GrowableObjectArray::Handle(isolate, GrowableObjectArray::New());
+        TrailPtr trail = new Trail(4);
         FinalizeTypeArguments(owner_class, full_arguments, offset,
-                              &bound_error, pending_types, &trail);
+                              &bound_error, pending_types, trail);
       }
       if (full_arguments.IsRaw(0, num_type_arguments)) {
         // The parameterized_type is raw. Set its argument vector to null, which
         // is more efficient in type tests.
         full_arguments = TypeArguments::null();
       }
       parameterized_type.set_arguments(full_arguments);
     } else {
       ASSERT(full_arguments.IsNull());  // Use null vector for raw type.
     }
@@ skipping 2109 matching lines @@
   ASSERT(fields_array.Length() == ByteBuffer::NumberOfFields());
   field ^= fields_array.At(0);
   ASSERT(field.Offset() == ByteBuffer::data_offset());
   name ^= field.name();
   expected_name ^= String::New("_data");
   ASSERT(String::EqualsIgnoringPrivateKey(name, expected_name));
 #endif
 }
 
 }  // namespace dart