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

frog/tests/leg_only/closure4_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.
-
-closure0() {
-  var f = fib(i) {
-    if (i < 2) return i;
-    return fib(i - 1) + fib(i - 2);
-  };
-  Expect.equals(5, f(5));
-}
-
-closure1() {
-  var decr1 = 0;
-  var decr2 = 0;
-  var f = fib(i) {
-    if (i < 2) return i;
-    return fib(i - decr1) + fib(i - decr2);
-  };
-  decr1++;
-  decr2 += 2;
-  Expect.equals(5, f(5));
-}
-
-closure2() {
-  var f = fun(doReturnClosure) {
-    if (doReturnClosure) {
-      return inner() => fun(false);
-    } else {
-      return 499;
-    }
-  };
-  var g = f(true);
-  Expect.equals(499, g());
-}
-
-main() {
-  closure0();
-  closure1();
-  closure2();
-}