pkg/compiler: fix imports

pkg/compiler/lib/src/inferrer/node_tracer.dart

 // Copyright (c) 2013, 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 compiler.src.inferrer.node_tracer;
 
 import '../common/names.dart' show Identifiers;
 import '../compiler.dart' show Compiler;
 import '../elements/elements.dart';
 import '../types/types.dart' show ContainerTypeMask, MapTypeMask;
 import '../util/util.dart' show Setlet;
-
+import 'debug.dart' as debug;
 import 'type_graph_inferrer.dart' show TypeGraphInferrerEngine;
 import 'type_graph_nodes.dart';
-import 'debug.dart' as debug;
 
 // A set of selectors we know do not escape the elements inside the
 // list.
 Set<String> doesNotEscapeListSet = new Set<String>.from(const <String>[
   // From Object.
   '==',
   'hashCode',
   'toString',
   'noSuchMethod',
   'runtimeType',
@@ skipping 371 matching lines @@
     }
     if (isParameterOfListAddingMethod(info.element) ||
         isParameterOfMapAddingMethod(info.element)) {
       // These elements are being handled in
       // [visitDynamicCallSiteTypeInformation].
       return;
     }
     addNewEscapeInformation(info);
   }
 }