Patch refactoring.

lib/compiler/implementation/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.
 
 class SsaCodeGeneratorTask extends CompilerTask {
 
   final JavaScriptBackend backend;
 
   SsaCodeGeneratorTask(JavaScriptBackend backend)
       : this.backend = backend,
@@ skipping 1685 matching lines @@
       for (int i = 0; i < inputs.length; i++) {
         use(inputs[i]);
         data.add(pop());
       }
       push(new js.LiteralExpression.withData(code, data), node);
     }
   }
 
   visitForeignNew(HForeignNew node) {
     int j = 0;
-    node.element.forEachInstanceField(
+    node.element.implementation.forEachInstanceField(
       includeBackendMembers: true,
       includeSuperMembers: true,
       f: (ClassElement enclosingClass, Element member) {
         backend.updateFieldInitializers(member, types[node.inputs[j]]);
         j++;
       });
     String jsClassReference = backend.namer.isolateAccess(node.element);
     List<HInstruction> inputs = node.inputs;
     // We can't use 'visitArguments', since our arguments start at input[0].
     List<js.Expression> arguments = <js.Expression>[];
@@ skipping 1277 matching lines @@
   if (leftType.canBeNull() && rightType.canBeNull()) {
     if (left.isConstantNull() || right.isConstantNull() ||
         (leftType.isPrimitive() && leftType == rightType)) {
       return '==';
     }
     return null;
   } else {
     return '===';
   }
 }