dart2js cps: Handle error cases.

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 '../dart2jslib.dart' as dart2js;
 import '../dart_types.dart';
 import '../elements/elements.dart';
 import '../cps_ir/cps_ir_nodes.dart' as cps_ir;
@@ skipping 311 matching lines @@
     internalError(CURRENT_ELEMENT_SPANNABLE, 'Unexpected IR node: $node');
   }
 
   // JS-specific nodes are handled by a subclass.
   visitSetField(cps_ir.SetField node) => unexpectedNode(node);
   visitIdentical(cps_ir.Identical node) => unexpectedNode(node);
   visitInterceptor(cps_ir.Interceptor node) => unexpectedNode(node);
   visitCreateInstance(cps_ir.CreateInstance node) => unexpectedNode(node);
   visitGetField(cps_ir.GetField node) => unexpectedNode(node);
   visitCreateBox(cps_ir.CreateBox node) => unexpectedNode(node);
+  visitCreateInvocationMirror(cps_ir.CreateInvocationMirror node) {
+    return unexpectedNode(node);
+  }
 
   // Executable definitions are not visited directly.  They have 'build'
   // functions as entry points.
   visitFieldDefinition(cps_ir.FieldDefinition node) {
     return unexpectedNode(node);
   }
   visitFunctionDefinition(cps_ir.FunctionDefinition node) {
     return unexpectedNode(node);
   }
   visitConstructorDefinition(cps_ir.ConstructorDefinition node) {
@@ skipping 312 matching lines @@
   }
 
   @override
   Node visitTypeExpression(cps_ir.TypeExpression node) {
     return new TypeExpression(
         node.dartType,
         node.arguments.map(getVariableUse).toList());
   }
 }