Add List.reversed to give a reverse fixed-length view of a list.

runtime/lib/growable_array.dart

Index: runtime/lib/growable_array.dart
diff --git a/runtime/lib/growable_array.dart b/runtime/lib/growable_array.dart
index ce650cc20887cd1487cb4545ffd04482a887aa48..52bced7530f0e787bc4a62c24874859ecc3b9669 100644
--- a/runtime/lib/growable_array.dart
+++ b/runtime/lib/growable_array.dart
@@ -291,6 +291,8 @@ class _GrowableObjectArray<T> implements List<T> {
     this.length = 0;
   }
 
+  List<T> get reversed => new ReversedListView<T>(this, 0, null);
+
   void sort([int compare(T a, T b)]) {
     IterableMixinWorkaround.sortList(this, compare);
   }