dart2js cps: Use oneshot interceptors and 'instanceof' expressions.

pkg/compiler/lib/src/tree_ir/tree_ir_builder.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_builder;
 
 import '../common.dart';
 import '../constants/values.dart';
 import '../cps_ir/cps_ir_nodes.dart' as cps_ir;
 import '../elements/elements.dart';
@@ skipping 563 matching lines @@
                         getVariableUse(node.value));
   }
 
   Expression visitInvokeStatic(cps_ir.InvokeStatic node) {
     List<Expression> arguments = translateArguments(node.arguments);
     return new InvokeStatic(node.target, node.selector, arguments,
                                          node.sourceInformation);
   }
 
   Expression visitInvokeMethod(cps_ir.InvokeMethod node) {
+    if (node.callingConvention == cps_ir.CallingConvention.OneShotIntercepted) {
+      List<Expression> arguments = new List.generate(
+          1 + node.arguments.length,
+          (n) => getVariableUse(n == 0 ? node.receiver : node.arguments[n - 1]),
+          growable: false);
+      return new OneShotInterceptor(node.selector, node.mask, arguments,
+          node.sourceInformation);
+    }
     InvokeMethod invoke = new InvokeMethod(
         getVariableUse(node.receiver),
         node.selector,
         node.mask,
         translateArguments(node.arguments),
         node.sourceInformation);
     // Sometimes we know the Dart receiver is non-null because it has been
     // refined, which implies that the JS receiver also can not be null at the
     // use-site.  Interceptors are not refined, so this information is not
     // always available on the JS receiver.
@@ skipping 97 matching lines @@
     internalError(CURRENT_ELEMENT_SPANNABLE, 'Unexpected IR node: $node');
   }
 
   visitFunctionDefinition(cps_ir.FunctionDefinition node) {
     unexpectedNode(node);
   }
   visitParameter(cps_ir.Parameter node) => unexpectedNode(node);
   visitContinuation(cps_ir.Continuation node) => unexpectedNode(node);
   visitMutableVariable(cps_ir.MutableVariable node) => unexpectedNode(node);
 }