Add dependencies to type variables used in the super type declaration, but do

tests/compiler/dart2js_extra/deferred/interface_type_variable_lib.dart

Index: tests/compiler/dart2js_extra/deferred/interface_type_variable_lib.dart
diff --git a/tests/compiler/dart2js_extra/deferred/interface_type_variable_lib.dart b/tests/compiler/dart2js_extra/deferred/interface_type_variable_lib.dart
new file mode 100644
index 0000000000000000000000000000000000000000..fb18b05f3180bcbf077ad195facc8bfe0bbca6e1
--- /dev/null
+++ b/tests/compiler/dart2js_extra/deferred/interface_type_variable_lib.dart
@@ -0,0 +1,15 @@
+// Copyright (c) 2017, 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.
+
+class A {}
+
+class I<T> {}
+
+// C needs to include "N", otherwise checking for `is I<A>` will likely cause
+// problems
+class C extends A implements I<N> {}
+
+class N extends A {}
+
+doCheck(x) => x is I<A>;