Make the universe parts into small libraries.

pkg/compiler/lib/src/resolution/operators.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.operators;
 
 import '../elements/elements.dart';
-import '../universe/universe.dart' show
-    CallStructure,
+import '../universe/call_structure.dart' show
+    CallStructure;
+import '../universe/selector.dart' show
     Selector,
     SelectorKind;
 
 enum UnaryOperatorKind {
   NOT,
   NEGATE,
   COMPLEMENT,
 }
 
 class UnaryOperator {
@@ skipping 390 matching lines @@
       const IncDecOperator._(IncDecOperatorKind.DEC, '--', BinaryOperator.SUB);
 
   static IncDecOperator parse(String value) {
     switch (value) {
       case '++': return INC;
       case '--': return DEC;
       default: return null;
     }
   }
 }