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

pkg/compiler/lib/src/cps_ir/cps_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 dart2js.ir_tracer;
 
 import 'dart:async' show EventSink;
 import 'cps_ir_nodes.dart' as cps_ir hide Function;
 import '../tracer.dart';
 
@@ skipping 353 matching lines @@
   visitCreateInvocationMirror(cps_ir.CreateInvocationMirror node) {
     String args = node.arguments.map(formatReference).join(', ');
     return "CreateInvocationMirror(${node.selector.name}, $args)";
   }
 
   visitTypeTest(cps_ir.TypeTest node) {
     String value = formatReference(node.value);
     String args = node.typeArguments.map(formatReference).join(', ');
     return "TypeTest ($value ${node.type} ($args))";
   }
+
+  visitApplyBuiltinOperator(cps_ir.ApplyBuiltinOperator node) {
+    String operator = node.operator.toString();
+    String args = node.arguments.map(formatReference).join(', ');
+    return 'ApplyBuiltinOperator $operator ($args)';
+  }
 }
 
 /**
  * Invents (and remembers) names for Continuations, Parameters, etc.
  * The names must match the conventions used by IR Hydra, e.g.
  * Continuations and Functions must have names of form B### since they
  * are visualized as basic blocks.
  */
 class Names {
   final Map<Object, String> names = {};
@@ skipping 205 matching lines @@
   }
   visitIsTrue(cps_ir.IsTrue node) {
     unexpectedNode(node);
   }
   visitIdentical(cps_ir.Identical node) {
     unexpectedNode(node);
   }
   visitInterceptor(cps_ir.Interceptor node) {
     unexpectedNode(node);
   }
-
   visitReadTypeVariable(cps_ir.ReadTypeVariable node) {
     unexpectedNode(node);
   }
-
   visitReifyRuntimeType(cps_ir.ReifyRuntimeType node) {
     unexpectedNode(node);
   }
-
   visitTypeExpression(cps_ir.TypeExpression node) {
     unexpectedNode(node);
   }
-
   visitNonTailThrow(cps_ir.NonTailThrow node) {
     unexpectedNode(node);
   }
-
   visitCreateInvocationMirror(cps_ir.CreateInvocationMirror node) {
     unexpectedNode(node);
   }
-
   visitTypeTest(cps_ir.TypeTest node) {
     unexpectedNode(node);
   }
+  visitApplyBuiltinOperator(cps_ir.ApplyBuiltinOperator node) {
+    unexpectedNode(node);
+  }
 }