Move some core classes to collection library.

sdk/lib/_internal/compiler/implementation/dart2js.dart

 // Copyright (c) 2012, 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;
 
 import 'dart:async';
+import 'dart:collection' show Queue, LinkedHashMap;

[Lasse Reichstein Nielsen, 2013/01/21 08:55:49]

Why the "show"? Is there a conflict?

[floitsch, 2013/01/21 10:40:10]

I don't think so, but I didn't want to take the risk.

 import 'dart:io';
 import 'dart:uri';
 import 'dart:utf';
 
 import '../compiler.dart' as api;
 import 'colors.dart' as colors;
 import 'source_file.dart';
 import 'filenames.dart';
 import 'util/uri_extras.dart';
 
@@ skipping 448 matching lines @@
     } catch (ignored) {
       print('Internal error: error while printing exception');
     }
     try {
       print(trace);
     } finally {
       exit(253); // 253 is recognized as a crash by our test scripts.
     }
   }
 }