Move kernel baseline tests to front_end.

pkg/front_end/test/fasta/rasta/issue_000004.dart

-// Copyright (c) 2016, 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.md file.
-
-import 'package:expect/expect.dart';
-
-fact4() {
-  var f = 1;
-  for (var n in [1, 2, 3, 4]) {
-    f *= n;
-  }
-  return f;
-}
-
-fact5() {
-  var f = 1, n;
-  for (n in [1, 2, 3, 4, 5]) {
-    f *= n;
-  }
-  return f;
-}
-
-var global;
-fact6() {
-  var f = 1;
-  for (global in [1, 2, 3, 4, 5, 6]) {
-    f *= global;
-  }
-  return f;
-}
-
-main() {
-  Expect.isTrue(fact4() == 24);
-  Expect.isTrue(fact5() == 120);
-  Expect.isTrue(fact6() == 720);
-}