Cleanup 1: split parts into their own libraries, remove unused imports

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.
 
 library universe.side_effects;
 
-import '../common.dart';
-
 class SideEffects {
   // Changes flags.
   static const int FLAG_CHANGES_INDEX = 0;
   static const int FLAG_CHANGES_INSTANCE_PROPERTY = FLAG_CHANGES_INDEX + 1;
   static const int FLAG_CHANGES_STATIC_PROPERTY
       = FLAG_CHANGES_INSTANCE_PROPERTY + 1;
   static const int FLAG_CHANGES_COUNT = FLAG_CHANGES_STATIC_PROPERTY + 1;
 
   // Depends flags (one for each changes flag).
   static const int FLAG_DEPENDS_ON_INDEX_STORE = FLAG_CHANGES_COUNT;
@@ skipping 105 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();
   }
 }