Use closure conversion in new dart2js backend.

pkg/compiler/lib/src/cps_ir/cps_ir_tracer.dart

 // Copyright (c) 2014, 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.
 
 library dart2js.ir_tracer;
 
 import 'dart:async' show EventSink;
 
 import 'cps_ir_nodes.dart' as cps_ir hide Function;
 import '../tracer.dart';
@@ skipping 233 matching lines @@
   }
 
   visitContinuation(cps_ir.Continuation node) {
     return "Continuation ${names.name(node)}";
   }
 
   visitIsTrue(cps_ir.IsTrue node) {
     return "IsTrue(${names.name(node.value.definition)})";
   }
 
+  visitSetField(cps_ir.SetField node) {
+    String dummy = names.name(node);
+    String object = formatReference(node.object);
+    String field = node.field.name;
+    String value = formatReference(node.value);
+    printStmt(dummy, 'SetField $object.$field = $value');
+    visit(node.body);
+  }
+
+  visitGetField(cps_ir.GetField node) {
+    String object = formatReference(node.object);
+    String field = node.field.name;
+    return 'GetField($object.$field)';
+  }
+
+  visitCreateBox(cps_ir.CreateBox node) {
+    return 'CreateBox';
+  }
+
+  visitCreateClosureClass(cps_ir.CreateClosureClass node) {
+    String className = node.classElement.name;
+    String arguments = node.arguments.map(formatReference).join(', ');
+    return 'CreateClosureClass $className ($arguments)';
+  }
+
   visitIdentical(cps_ir.Identical node) {
     String left = formatReference(node.left);
     String right = formatReference(node.right);
     return "Identical($left, $right)";
   }
 
   visitInterceptor(cps_ir.Interceptor node) {
-    return "Interceptor(${node.input})";
+    return "Interceptor(${formatReference(node.input)})";
   }
 
   visitThis(cps_ir.This node) {
     return "This";
   }
 
   visitReifyTypeVar(cps_ir.ReifyTypeVar node) {
     return "ReifyTypeVar ${node.typeVariable.name}";
   }
 
@@ skipping 153 matching lines @@
   }
 
   visitInvokeContinuation(cps_ir.InvokeContinuation exp) {
     addEdgeToContinuation(exp.continuation);
   }
 
   visitSetClosureVariable(cps_ir.SetClosureVariable exp) {
     visit(exp.body);
   }
 
+  visitSetField(cps_ir.SetField exp) {
+    visit(exp.body);
+  }
+
   visitDeclareFunction(cps_ir.DeclareFunction exp) {
     visit(exp.body);
   }
 
   visitBranch(cps_ir.Branch exp) {
     cps_ir.Continuation trueTarget = exp.trueContinuation.definition;
     if (!trueTarget.isReturnContinuation) {
       current_block.addEdgeTo(getBlock(trueTarget));
     }
     cps_ir.Continuation falseTarget = exp.falseContinuation.definition;
     if (!falseTarget.isReturnContinuation) {
       current_block.addEdgeTo(getBlock(falseTarget));
     }
   }
 
   visitContinuation(cps_ir.Continuation c) {
     var old_node = current_block;
     current_block = getBlock(c);
     visit(c.body);
     current_block = old_node;
   }
 }