Add HCreateBox

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

 // Copyright (c) 2013, 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 ssa.tracer;
 
 import '../../compiler_new.dart' show OutputSink;
 import '../diagnostics/invariant.dart' show DEBUG_MODE;
 import '../js_backend/namer.dart' show Namer;
 import '../tracer.dart';
@@ skipping 187 matching lines @@
     if (node.label != null) {
       return "Continue ${node.label.labelName}: (B${target.id})";
     }
     return "Continue: (B${target.id})";
   }
 
   String visitCreate(HCreate node) {
     return handleGenericInvoke("Create", "${node.element.name}", node.inputs);
   }
 
+  String visitCreateBox(HCreateBox node) {
+    return handleGenericInvoke("CreateBox", "", node.inputs);
+  }
+
   String visitDivide(HDivide node) => handleInvokeBinary(node, 'Divide');
 
   String visitExit(HExit node) => "Exit";
 
   String visitFieldGet(HFieldGet node) {
     if (node.isNullCheck) {
       return 'FieldGet: NullCheck ${temporaryId(node.receiver)}';
     }
     String fieldName = node.element.name;
     return 'FieldGet: ${temporaryId(node.receiver)}.$fieldName';
@@ skipping 315 matching lines @@
   }
 
   String visitAwait(HAwait node) {
     return "Await: ${temporaryId(node.inputs[0])}";
   }
 
   String visitYield(HYield node) {
     return "Yield${node.hasStar ? "*" : ""}: ${temporaryId(node.inputs[0])}";
   }
 }