Move generated files to gen/.

test/codegen/methods.dart

-// Copyright (c) 2015, 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.
-
-library methods;
-
-class A {
-  int x() => 42;
-
-  int y(int a) {
-    return a;
-  }
-
-  int z([num b]) => b;
-
-  int zz([int b = 0]) => b;
-
-  int w(int a, {num b}) {
-    return a + b;
-  }
-
-  int ww(int a, {int b: 0}) {
-    return a + b;
-  }
-
-  clashWithObjectProperty({constructor}) => constructor;
-  clashWithJsReservedName({function}) => function;
-
-  int get a => x();
-
-  void set b(int b) {}
-
-  int _c = 3;
-
-  int get c => _c;
-
-  void set c(int c) {
-    _c = c;
-  }
-}
-
-class Bar {
-  call(x) => print('hello from $x');
-}
-class Foo {
-  final Bar bar = new Bar();
-}
-
-test() {
-  // looks like a method but is actually f.bar.call(...)
-  var f = new Foo();
-  f.bar("Bar's call method!");
-
-  // Tear-off
-  A a = new A();
-  var g = a.x;
-
-  // Dynamic Tear-off
-  dynamic aa = new A();
-  var h = aa.x;
-
-  // Tear-off of object methods
-  var ts = a.toString;
-  var nsm = a.noSuchMethod;
-
-  // Tear-off extension methods
-  var c = "".padLeft;
-  var r = (3.0).floor;
-}