Move dart2js from sdk/lib/_internal/compiler to pkg/compiler

pkg/compiler/lib/src/ordered_typeset.dart

 // Copyright (c) 2013, 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 ordered_typeset;
 
 import 'dart2jslib.dart' show Compiler, MessageKind, invariant;
 import 'dart_types.dart';
 import 'elements/elements.dart' show ClassElement;
 import 'util/util.dart' show Link, LinkBuilder;
@@ skipping 201 matching lines @@
         while (first.tail != null) {
           sb.write(', ${first.tail.head}');
           first = first.tail;
         }
       }
       sb.write('\n');
     }
     return sb.toString();
   }
 }