Move kernel baseline tests to front_end.

pkg/front_end/test/fasta/rasta/for_loop.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.
-
-main() {
-  int c = new DateTime.now().millisecondsSinceEpoch;
-  for (int i = 0; i < 100; i++) {
-    print(i++);
-  }
-  for (int i = 0; i < 100; c < 42 ? throw "fisk" : i++) {
-    print(i++);
-  }
-}