Use temporaryId instead of the Ssa node in the tracer.

sdk/lib/_internal/compiler/implementation/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 tracer;
 
 import 'dart:async' show EventSink;
 
 import 'ssa.dart';
 import '../js_backend/js_backend.dart';
@@ skipping 431 matching lines @@
     return "Static $lhs = ${temporaryId(node.inputs[0])}";
   }
 
   String visitStringConcat(HStringConcat node) {
     var leftId = temporaryId(node.left);
     var rightId = temporaryId(node.right);
     return "StringConcat: $leftId + $rightId";
   }
 
   String visitStringify(HStringify node) {
-    return "Stringify: ${node.inputs[0]}";
+    return "Stringify ${temporaryId(node.inputs[0])}";
   }
 
   String visitSubtract(HSubtract node) => handleInvokeBinary(node, '-');
 
   String visitSwitch(HSwitch node) {
     StringBuffer buf = new StringBuffer();
     buf.write("Switch: (");
     buf.write(temporaryId(node.inputs[0]));
     buf.write(") ");
     for (int i = 1; i < node.inputs.length; i++) {
@@ skipping 76 matching lines @@
   }
 
   String visitInterfaceType(HInterfaceType node) {
     return "InterfaceType: ${node.dartType}";
   }
 
   String visitDynamicType(HDynamicType node) {
     return "DynamicType";
   }
 }