Move kernel baseline tests to front_end.

pkg/front_end/test/fasta/cycles.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 file.
-
-class A implements C {
-}
-
-class B extends A {
-}
-
-class C extends B implements D {
-}
-
-class D {
-}
-
-main() {
-  print(new A());
-  print(new B());
-  print(new C());
-  print(new D());
-}