Less inequivalence on Hello World!

pkg/compiler/lib/src/ssa/graph_builder.dart

 // Copyright (c) 2016, 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 '../closure.dart' show ClosureDataLookup;
 import '../constants/constant_system.dart';
 import '../common/codegen.dart' show CodegenRegistry;
 import '../common_elements.dart';
 import '../compiler.dart';
 import '../deferred_load.dart';
@@ skipping 81 matching lines @@
   RuntimeTypesEncoder get rtiEncoder => backend.rtiEncoder;
 
   FunctionInlineCache get inlineCache => backend.inlineCache;
 
   MirrorsData get mirrorsData => backend.mirrorsData;
 
   JsInteropAnalysis get jsInteropAnalysis => backend.jsInteropAnalysis;
 
   DeferredLoadTask get deferredLoadTask => compiler.deferredLoadTask;
 
-  DartTypes get types => compiler.types;
+  DartTypes get types => closedWorld.dartTypes;
 
   /// Used to track the locals while building the graph.
   LocalsHandler localsHandler;
 
   /// A stack of instructions.
   ///
   /// We build the SSA graph by simulating a stack machine.
   List<HInstruction> stack = <HInstruction>[];
 
   /// The count of nested loops we are currently building.
@@ skipping 185 matching lines @@
         return mirrorsData.mustRetainMetadata;
       case 'USE_CONTENT_SECURITY_POLICY':
         return options.useContentSecurityPolicy;
       case 'IS_FULL_EMITTER':
         return !USE_LAZY_EMITTER && !options.useStartupEmitter;
       default:
         return null;
     }
   }
 }