dart2js cps: Remove NonTailThrow.

pkg/compiler/lib/src/cps_ir/cps_ir_nodes_sexpr.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_nodes_sexpr;
 
 import '../constants/values.dart';
 import '../util/util.dart';
 import 'cps_ir_nodes.dart';
 import '../universe/universe.dart' show Selector, CallStructure;
@@ skipping 296 matching lines @@
 
   String visitReadTypeVariable(ReadTypeVariable node) {
     return '(ReadTypeVariable ${access(node.target)}.${node.variable})';
   }
 
   String visitTypeExpression(TypeExpression node) {
     String args = node.arguments.map(access).join(' ');
     return '(TypeExpression ${node.dartType} ($args))';
   }
 
-  String visitNonTailThrow(NonTailThrow node) {
-    String value = access(node.value);
-    return '(NonTailThrow $value)';
-  }
-
   String visitCreateInvocationMirror(CreateInvocationMirror node) {
     String selector = node.selector.name;
     String args = node.arguments.map(access).join(' ');
     return '(CreateInvocationMirror $selector ($args))';
   }
 
   String visitApplyBuiltinOperator(ApplyBuiltinOperator node) {
     String operator = node.operator.toString();
     String args = node.arguments.map(access).join(' ');
     return '(ApplyBuiltinOperator $operator ($args))';
@@ skipping 130 matching lines @@
   void setReturnContinuation(Continuation node) {
     assert(!_names.containsKey(node) || _names[node] == 'return');
     _names[node] = 'return';
   }
 
   String getName(Node node) {
     if (!_names.containsKey(node)) return 'MISSING_NAME';
     return _names[node];
   }
 }