dart2js cps_ir: Use interceptors for is-checks (version 2)

pkg/compiler/lib/src/tree_ir/tree_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 tree_ir_tracer;
 
 import 'dart:async' show EventSink;
 import '../tracer.dart';
 import 'tree_ir_nodes.dart';
 
@@ skipping 480 matching lines @@
     String element = node.element.name;
     return element;
   }
 
   String visitSetStatic(SetStatic node) {
     String element = node.element.name;
     String value = visitExpression(node.value);
     return '$element = $value';
   }
 
+  String visitGetTypeTestProperty(GetTypeTestProperty node) {
+    String object = visitExpression(node.object);
+    if (usesInfixNotation(node.object)) {
+      object = '($object)';
+    }
+    // TODO(sra): Fix up this.
+    return '$object."is-${node.dartType}"';
+  }
+
   String visitCreateBox(CreateBox node) {
     return 'CreateBox';
   }
 
   String visitCreateInstance(CreateInstance node) {
     String className = node.classElement.name;
     String arguments = node.arguments.map(visitExpression).join(', ');
     return 'CreateInstance $className($arguments)';
   }
 
@@ skipping 93 matching lines @@
     if (name == null) {
       String prefix = v.element == null ? 'v' : '${v.element.name}_';
       while (name == null || _usedNames.contains(name)) {
         name = "$prefix${_counter++}";
       }
       _names[v] = name;
       _usedNames.add(name);
     }
     return name;
   }
-}
+}