dart2js cps: Introduce some built-in operators in type propagation.

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 491 matching lines @@
   @override
   String visitTypeExpression(TypeExpression node) {
     return node.dartType.toString();
   }
 
   @override
   String visitCreateInvocationMirror(CreateInvocationMirror node) {
     String args = node.arguments.map(visitExpression).join(', ');
     return 'CreateInvocationMirror(${node.selector.name}, $args)';
   }
+
+  @override
+  String visitApplyBuiltinOperator(ApplyBuiltinOperator node) {
+    String args = node.arguments.map(visitExpression).join(', ');
+    return 'ApplyBuiltinOperator ${node.operator} ($args)';
+  }
 }
 
 /**
  * Invents (and remembers) names for Variables that do not have an associated
  * identifier.
  *
  * In case a variable is named v0, v1, etc, it may be assigned a different
  * name to avoid clashing with a previously synthesized variable name.
  */
 class Names {
   final Map<Variable, String> _names = {};
   final Set<String> _usedNames = new Set();
   int _counter = 0;
 
   String varName(Variable v) {
     String name = _names[v];
     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;
   }
 }