Handle non-factory redirects in constant evaluation.

tests/language/compile_time_constant_checked4_test.dart

+// Copyright (c) 2014, 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 {
+  final _x;
+  const A.a1(
+    String /// 01: checked mode compile-time error, static type warning
+    x) : this.a2(x);
+  const A.a2(
+    String /// 02: checked mode compile-time error
+    x) : this.a3(x);
+  const A.a3(
+    String /// 03: checked mode compile-time error
+    x) : _x = x;
+}
+
+use(x) => x;
+
+main() {
+  use(const A.a1(0));
+}