Adjust index of type parameters at finalization time (fix issue 718).

tests/language/src/Generics2Test.dart

+// Copyright (c) 2011, 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.
+// VMOptions=--enable_type_checks
+//
+// Dart test program testing generic type allocations and generic type tests.
+
+class A<E> { }
+
+class Pair<P, Q> extends A /* i.e. extends A<Dynamic> */ {
+  final P fst;
+  final Q snd;
+  Pair(this.fst, this.snd);
+}
+
+main() {
+  print(new Pair<int,int>(1, 2));
+  print(new Pair<String,int>("1", 2));
+}
+