dart2js cps: Clean up and avoid processing unreachable code.

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;
 import '../tracer.dart';
 
@@ skipping 294 matching lines @@
     String typeInformation =
         node.typeInformation.map(formatReference).join(', ');
     return 'CreateInstance $className ($arguments) <$typeInformation>';
   }
 
   visitInterceptor(cps_ir.Interceptor node) {
     return 'Interceptor(${formatReference(node.input)}, '
            '${node.interceptedClasses})';
   }
 
-  visitCreateFunction(cps_ir.CreateFunction node) {
-    return "CreateFunction ${node.definition.element.name}";
-  }
-
   visitGetMutable(cps_ir.GetMutable node) {
     String variable = names.name(node.variable.definition);
     return 'GetMutable $variable';
   }
 
   visitReadTypeVariable(cps_ir.ReadTypeVariable node) {
     return "ReadTypeVariable ${node.variable.element} "
         "${formatReference(node.target)}";
   }
 
   visitReifyRuntimeType(cps_ir.ReifyRuntimeType node) {
     return "ReifyRuntimeType ${formatReference(node.value)}";
   }
 
   visitTypeExpression(cps_ir.TypeExpression node) {
     return "TypeExpression ${node.dartType} "
         "${node.arguments.map(formatReference).join(', ')}";
   }
 
   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(', ');
-    String interceptor = node.interceptor == null
-        ? ''
-        : ' ${formatReference(node.interceptor)}';
-    return "TypeTest ($value ${node.dartType} ($args)$interceptor)";
+    return "TypeTest ($value ${node.dartType} ($args))";
   }
 
   visitTypeTestViaFlag(cps_ir.TypeTestViaFlag node) {
     String interceptor = formatReference(node.interceptor);
     return "TypeTestViaFlag ($interceptor ${node.dartType})";
   }
 
   visitApplyBuiltinOperator(cps_ir.ApplyBuiltinOperator node) {
     String operator = node.operator.toString();
     String args = node.arguments.map(formatReference).join(', ');
@@ skipping 208 matching lines @@
   }
 
   visitLiteralMap(cps_ir.LiteralMap node) {
     unexpectedNode(node);
   }
 
   visitConstant(cps_ir.Constant node) {
     unexpectedNode(node);
   }
 
-  visitCreateFunction(cps_ir.CreateFunction node) {
-    unexpectedNode(node);
-  }
-
   visitGetMutable(cps_ir.GetMutable node) {
     unexpectedNode(node);
   }
 
   visitParameter(cps_ir.Parameter node) {
     unexpectedNode(node);
   }
 
   visitMutableVariable(cps_ir.MutableVariable node) {
     unexpectedNode(node);
@@ skipping 84 matching lines @@
   }
 
   visitYield(cps_ir.Yield node) {
     unexpectedNode(node);
   }
 
   visitRefinement(cps_ir.Refinement node) {
     unexpectedNode(node);
   }
 }