Make the universe parts into small libraries.

pkg/compiler/lib/src/constants/evaluation.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.constants.evaluation;
 
 import '../compiler.dart' show
     Compiler;
-import '../universe/universe.dart' show
+import '../universe/call_structure.dart' show
     CallStructure;
 import 'expressions.dart';
 
 /// Environment used for evaluating constant expressions.
 abstract class Environment {
   // TODO(johnniwinther): Replace this with [CoreTypes] and maybe [Backend].
   Compiler get compiler;
 
   /// Read environments string passed in using the '-Dname=value' option.
   String readFromEnvironment(String name);
@@ skipping 20 matching lines @@
 
   /// Returns the normalized [index]th positional argument.
   ConstantExpression getPositionalArgument(int index) {
     if (index >= callStructure.positionalArgumentCount) {
       // The positional argument is not provided.
       return defaultValues[index];
     }
     return arguments[index];
   }
 }