Precompute `IgnoreInfo` in Scanner.

pkg/analyzer/lib/task/general.dart

 // Copyright (c) 2015, 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 analyzer.task.general;
 
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/task/model.dart';
 
 /**
  * The content of a [Source].
  */
 final ResultDescriptor<String> CONTENT =
     new ResultDescriptor<String>('CONTENT', null);
 
 /**
+ * The ignore information for a [Source].
+ */
+final ResultDescriptor<IgnoreInfo> IGNORE_INFO =
+    new ResultDescriptor<IgnoreInfo>('IGNORE_INFO', null);

[scheglov, 2016/05/27 18:05:47]

Do we need this as a public information?

[Brian Wilkerson, 2016/05/27 18:21:18]

I'd make it an internal result until we find a reason to make it public.

[pquitslund, 2016/05/27 21:50:53]

Done.

+
+/**
  * The line information for a [Source].
  */
 final ResultDescriptor<LineInfo> LINE_INFO =
     new ResultDescriptor<LineInfo>('LINE_INFO', null);
 
 /**
  * The modification time of a [Source].
  */
 final ResultDescriptor<int> MODIFICATION_TIME =
     new ResultDescriptor<int>('MODIFICATION_TIME', -1);