Wire GrowableArray to use the internal VM object.

vm/raw_object.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_RAW_OBJECT_H_
 #define VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 #include "vm/token.h"
@@ skipping 1033 matching lines @@
   RAW_HEAP_OBJECT_IMPLEMENTATION(ImmutableArray);
 
   friend class SnapshotReader;
 };
 
 
 class RawGrowableObjectArray : public RawInstance {
   RAW_HEAP_OBJECT_IMPLEMENTATION(GrowableObjectArray);
 
   RawObject** from() {
-    return reinterpret_cast<RawObject**>(&ptr()->length_);
+    return reinterpret_cast<RawObject**>(&ptr()->type_arguments_);
   }
+  RawAbstractTypeArguments* type_arguments_;
   RawSmi* length_;
   RawArray* data_;
   RawObject** to() {
     return reinterpret_cast<RawObject**>(&ptr()->data_);
   }
 
   friend class SnapshotReader;
 };
 
 
@@ skipping 101 matching lines @@
   intptr_t type_;  // Uninitialized, simple or complex.
   intptr_t flags_;  // Represents global/local, case insensitive, multiline.
 
   // Variable length data follows here.
   uint8_t data_[0];
 };
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_