Propagate types of static const variables.

pkg/compiler/lib/src/js_backend/codegen/task.dart

 // Copyright (c) 2014, 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.
 
 /// Generate code using the cps-based IR pipeline.
 library code_generator_task;
 
 import 'glue.dart';
 import 'codegen.dart';
 import 'unsugar.dart';
@@ skipping 183 matching lines @@
       if (cpsIntegrityChecker == null) {
         cpsIntegrityChecker = new CheckCpsIntegrity();
       }
       cpsIntegrityChecker.check(node, previousPass);
     });
     return true; // So this can be used from assert().
   }
 
   cps.FunctionDefinition optimizeCpsIr(cps.FunctionDefinition cpsFunction) {
     cpsOptimizationTask.measure(() {
-      TypeMaskSystem typeSystem = new TypeMaskSystem(compiler);
-
       applyCpsPass(new RedundantJoinEliminator(), cpsFunction);
       applyCpsPass(new RedundantPhiEliminator(), cpsFunction);
       applyCpsPass(new InsertRefinements(typeSystem), cpsFunction);
       applyCpsPass(new TypePropagator(compiler, typeSystem, this), cpsFunction);
       applyCpsPass(new RedundantJoinEliminator(), cpsFunction);
       applyCpsPass(new ShrinkingReducer(), cpsFunction);
       applyCpsPass(new RedundantRefinementEliminator(typeSystem), cpsFunction);
       applyCpsPass(new GVN(compiler), cpsFunction);
       applyCpsPass(new RemoveRefinements(), cpsFunction);
       applyCpsPass(new ShrinkingReducer(), cpsFunction);
@@ skipping 67 matching lines @@
         treeOptimizationTask]
       ..addAll(fallbackCompiler.tasks);
   }
 
   js.Node attachPosition(js.Node node, AstElement element) {
     return node.withSourceInformation(
         sourceInformationFactory.createBuilderForContext(element)
             .buildDeclaration(element));
   }
 }