Implement constructor bodies and initializers in CPS->JS 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 255 matching lines @@
   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) {
+  visitCreateInstance(cps_ir.CreateInstance node) {
     String className = node.classElement.name;
     String arguments = node.arguments.map(formatReference).join(', ');
-    return 'CreateClosureClass $className ($arguments)';
+    return 'CreateInstance $className ($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(${formatReference(node.input)})";
@@ skipping 189 matching lines @@
     }
   }
 
   visitContinuation(cps_ir.Continuation c) {
     var old_node = current_block;
     current_block = getBlock(c);
     visit(c.body);
     current_block = old_node;
   }
 }