dart2js cps: Remove NonTailThrow.

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 '../elements/elements.dart';
 import '../cps_ir/cps_ir_nodes.dart' as cps_ir;
 import '../util/util.dart' show CURRENT_ELEMENT_SPANNABLE;
@@ skipping 368 matching lines @@
   }
 
   Statement visitRethrow(cps_ir.Rethrow node) {
     return new Rethrow();
   }
 
   Statement visitUnreachable(cps_ir.Unreachable node) {
     return new Unreachable();
   }
 
-  Expression visitNonTailThrow(cps_ir.NonTailThrow node) {
-    return unexpectedNode(node);
-  }
-
   Statement continueWithExpression(cps_ir.Reference continuation,
                                    Expression expression) {
     cps_ir.Continuation cont = continuation.definition;
     if (cont == returnContinuation) {
       return new Return(expression);
     } else {
       assert(cont.parameters.length == 1);
       Function nextBuilder = cont.hasExactlyOneUse ?
           () => visit(cont.body) : () => new Break(labels[cont]);
       return buildContinuationAssignment(cont.parameters.single, expression,
@@ skipping 226 matching lines @@
                         getVariableUse(node.index));
   }
 
   Expression visitSetIndex(cps_ir.SetIndex node) {
     return new SetIndex(getVariableUse(node.object),
                         getVariableUse(node.index),
                         getVariableUse(node.value));
   }
 }