Pass ClosedWorld directly to codegen tasks

pkg/compiler/lib/src/ssa/interceptor_simplifier.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.
 
 import '../common/backend_api.dart' show BackendClasses;
 import '../compiler.dart' show Compiler;
 import '../constants/constant_system.dart';
 import '../constants/values.dart';
 import '../elements/elements.dart';
 import '../js_backend/backend.dart';
@@ skipping 19 matching lines @@
  * the interceptor and then call the method.  This saves code size and makes the
  * receiver of an intercepted call a candidate for being generated at use site.
  *
  * 5) Some HIs operations on an interceptor are replaced with a HIs version that
  * uses 'instanceof' rather than testing a type flag.
  *
  */
 class SsaSimplifyInterceptors extends HBaseVisitor
     implements OptimizationPhase {
   final String name = "SsaSimplifyInterceptors";
+  final ClosedWorld closedWorld;
   final ConstantSystem constantSystem;
   final Compiler compiler;
   final Element element;
   HGraph graph;
 
-  SsaSimplifyInterceptors(this.compiler, this.constantSystem, this.element);
+  SsaSimplifyInterceptors(
+      this.compiler, this.closedWorld, this.constantSystem, this.element);
 
   JavaScriptBackend get backend => compiler.backend;
 
-  ClosedWorld get closedWorld => compiler.closedWorld;
-
   BackendClasses get backendClasses => closedWorld.backendClasses;
 
   void visitGraph(HGraph graph) {
     this.graph = graph;
     visitDominatorTree(graph);
   }
 
   void visitBasicBlock(HBasicBlock node) {
     currentBlock = node;
 
@@ skipping 358 matching lines @@
       instruction = new HInvokeDynamicMethod(
           selector, mask, inputs, node.instructionType, true);
     }
 
     HBasicBlock block = node.block;
     block.addAfter(node, instruction);
     block.rewrite(node, instruction);
     return true;
   }
 }