Support named parameters for super initializers and redirections.

tests/language/src/ConstructorNamedArgumentsTest.dart

+// 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.
+// Dart test program for default constructors.
+
+String message;
+
+foo() {
+  message += 'foo';
+  return 1;
+}
+
+bar() {
+  message += 'bar';
+  return 2;
+}
+
+class X {
+  var i;
+  var j;
+  X([a = 'defa', b = 'defb']) : this.i = a, this.j = b;
+  X.foo() : this(b: 1, a: 2);
+  X.bar() : this(
+                     1,  /// 01: compile-time error
+                     a: 2);
+  X.baz() : this(a: 1, b: 2);
+  X.qux() : this(1, 2);
+  X.hest() : this();
+  X.fisk() : this(b: bar(), a: foo());
+  X.naebdyr() : this(a: foo(), b: bar());
+}
+
+test(x, a, b) {
+  Expect.equals(x.i, a);
+  Expect.equals(x.j, b);
+}
+
+main() {
+  test(new X.foo(), 2, 1);
+  test(new X.bar(), 2, 'defb');
+  test(new X.baz(), 1, 2);
+  test(new X.qux(), 1, 2);
+  test(new X.hest(), 'defa', 'defb');
+
+  message = '';
+  new X.fisk();
+  Expect.equals('barfoo', message);
+
+  message = '';
+  new X.naebdyr();
+  Expect.equals('foobar', message);
+}