Split World usage into open, inference, and closed world.

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/codegen.dart' show CodegenWorkItem;
 import '../compiler.dart' show Compiler;
 import '../constants/constant_system.dart';
 import '../constants/values.dart';
 import '../elements/elements.dart';
 import '../js_backend/backend_helpers.dart' show BackendHelpers;
@@ skipping 31 matching lines @@
   final Compiler compiler;
   final Element element;
   HGraph graph;
 
   SsaSimplifyInterceptors(this.compiler, this.constantSystem, this.element);
 
   JavaScriptBackend get backend => compiler.backend;
 
   BackendHelpers get helpers => backend.helpers;
 
-  ClassWorld get classWorld => compiler.world;
+  ClassWorld get classWorld => compiler.closedWorld;
 
   void visitGraph(HGraph graph) {
     this.graph = graph;
     visitDominatorTree(graph);
   }
 
   void visitBasicBlock(HBasicBlock node) {
     currentBlock = node;
 
     HInstruction instruction = node.first;
@@ skipping 352 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;
   }
 }