Handle redirecting constructors to DillMemberBuilder.

pkg/front_end/test/fasta/redirecting_constructor.dart

Index: pkg/front_end/test/fasta/redirecting_constructor.dart
diff --git a/pkg/front_end/test/fasta/redirecting_constructor.dart b/pkg/front_end/test/fasta/redirecting_constructor.dart
new file mode 100644
index 0000000000000000000000000000000000000000..2e0d92b0566c81d708ce84d98f433665323719ea
--- /dev/null
+++ b/pkg/front_end/test/fasta/redirecting_constructor.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 {
+  A();
+  factory A.fisk() = B;
+}
+
+class B extends A {
+}
+
+main() {
+  new A.fisk();
+}