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

pkg/compiler/lib/src/universe/side_effects.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.
 
 part of universe;
 
 class SideEffects {
   // Changes flags.
   static const int FLAG_CHANGES_INDEX = 0;
   static const int FLAG_CHANGES_INSTANCE_PROPERTY = FLAG_CHANGES_INDEX + 1;
@@ skipping 87 matching lines @@
     if (!dependsOnSomething()) buffer.write(' nothing');
     buffer.write(', Changes');
     if (changesIndex()) buffer.write(' []');
     if (changesInstanceProperty()) buffer.write(' field');
     if (changesStaticProperty()) buffer.write(' static');
     if (!hasSideEffects()) buffer.write(' nothing');
     buffer.write('.');
     return buffer.toString();
   }
 }