dart2js cps: Remove NonTailThrow.

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 321 matching lines @@
 
   visitReifyRuntimeType(cps_ir.ReifyRuntimeType node) {
     return "ReifyRuntimeType ${formatReference(node.value)}";
   }
 
   visitTypeExpression(cps_ir.TypeExpression node) {
     return "TypeExpression ${node.dartType} "
         "${node.arguments.map(formatReference).join(', ')}";
   }
 
-  visitNonTailThrow(cps_ir.NonTailThrow node) {
-    String value = formatReference(node.value);
-    return "NonTailThrow($value)";
-  }
-
   visitCreateInvocationMirror(cps_ir.CreateInvocationMirror node) {
     String args = node.arguments.map(formatReference).join(', ');
     return "CreateInvocationMirror(${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))";
   }
@@ skipping 255 matching lines @@
   }
 
   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);
@@ skipping 23 matching lines @@
     unexpectedNode(node);
   }
 
   @override
   visitForeignCode(cps_ir.ForeignCode node) {
     if (node.continuation != null) {
       addEdgeToContinuation(node.continuation);
     }
   }
 }