Use elements/types in constants/values

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

 // Copyright (c) 2012, 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 'dart:math' as math;
 import '../common.dart';
 import '../common/codegen.dart' show CodegenRegistry, CodegenWorkItem;
 import '../common/tasks.dart' show CompilerTask;
 import '../compiler.dart' show Compiler;
 import '../constants/constant_system.dart';
@@ skipping 2052 matching lines @@
       ConstantValue constant, SourceInformation sourceInformation) {
     if (constant.isFunction) {
       FunctionConstantValue function = constant;
       registry.registerStaticUse(new StaticUse.staticTearOff(function.element));
     }
     if (constant.isType) {
       // If the type is a web component, we need to ensure the constructors are
       // available to 'upgrade' the native object.
       TypeConstantValue type = constant;
       if (type.representedType.isInterfaceType) {
-        registry.registerTypeConstant(type.representedType.element);
+        InterfaceType representedType = type.representedType;
+        registry.registerTypeConstant(representedType.element);
       }
     }
     js.Expression expression = backend.emitter.constantReference(constant);
     if (!constant.isDummy) {
       // TODO(johnniwinther): Support source information on synthetic constants.
       expression = expression.withSourceInformation(sourceInformation);
     }
     push(expression);
   }
 
@@ skipping 1035 matching lines @@
     registry.registerStaticUse(new StaticUse.staticInvoke(
         helper, new CallStructure.unnamed(argumentCount)));
     return backend.emitter.staticFunctionAccess(helper);
   }
 
   @override
   void visitRef(HRef node) {
     visit(node.value);
   }
 }