Move frog/tests/{leg,leg_only,frog_native} to tests/compiler/.

frog/tests/leg_only/is_operator_test.dart

-// Copyright (c) 2012, 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 {
-}
-
-class B extends A {
-}
-
-main() {
-  var a = new A();
-  var b = new B();
-
-  Expect.isTrue(a is A);
-  Expect.isTrue(a is Object);
-  Expect.isTrue(!(a is B));
-
-  Expect.isTrue(b is A);
-  Expect.isTrue(b is Object);
-  Expect.isTrue(b is B);
-
-  Expect.equals("true", (a is A).toString());
-  Expect.equals("true", (a is Object).toString());
-  Expect.equals("false", (a is B).toString());
-
-  Expect.equals("true", (b is A).toString());
-  Expect.equals("true", (b is Object).toString());
-  Expect.equals("true", (b is B).toString());
-
-  var c = new A();
-  Expect.isTrue(c is Object);
-
-  c = new A();
-  Expect.equals("true", (c is Object).toString());
-}