Make the universe parts into small libraries.

pkg/compiler/lib/src/resolution/resolution_result.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 dart2js.resolution.result;
 
 import '../constants/expressions.dart';
 import '../dart_types.dart';
 import '../elements/elements.dart';
 import '../tree/tree.dart';
-import '../universe/universe.dart' show
+import '../universe/call_structure.dart' show
     CallStructure;
 
 enum ResultKind {
   NONE,
   ELEMENT,
   TYPE,
   ASSERT,
   CONSTANT,
   PREFIX,
 }
@@ skipping 115 matching lines @@
 
   /// Returns the list of [ConstantExpression]s for each of the arguments. If
   /// [isValidAsConstant] is `false`, `null` is returned.
   List<ConstantExpression> get constantArguments {
     if (!isValidAsConstant) return null;
     return argumentResults.map((ResolutionResult result) {
       return result.constant;
     }).toList();
   }
 }