Revert "dart2js cps: 'is' checks on types with type arguments."

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 438 matching lines @@
     if (usesInfixNotation(node.left)) {
       left = "($left)";
     }
     if (usesInfixNotation(node.right)) {
       right = "($right)";
     }
     return "$left ${node.operator} $right";
   }
 
   String visitTypeOperator(TypeOperator node) {
-    String value = visitExpression(node.value);
+    String receiver = visitExpression(node.receiver);
     String type = "${node.type}";
-    return "TypeOperator $value ${node.operator} $type";
+    return "TypeOperator $receiver ${node.operator} $type";
   }
 
   String visitNot(Not node) {
     String operand = visitExpression(node.operand);
     if (usesInfixNotation(node.operand)) {
       operand = '($operand)';
     }
     return '!$operand';
   }
 
@@ skipping 90 matching lines @@
       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;
   }
 }