pkg/compiler: fix imports

pkg/compiler/lib/src/options.dart

 // Copyright (c) 2016, 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.src.options;
 
+import '../compiler.dart' show PackagesDiscoveryProvider;
 import 'commandline_options.dart' show Flags;
-import '../compiler.dart' show PackagesDiscoveryProvider;
 
 /// Options used for parsing.
 ///
 /// Use this to conditionally support certain constructs, e.g.,
 /// experimental ones.
 abstract class ParserOptions {
   const ParserOptions();
 
   /// Support parsing of generic method declarations, and invocations of
   /// methods where type arguments are passed.
@@ skipping 710 matching lines @@
 }
 
 /// Locations of the platform descriptor files relative to the library root.
 const String _clientPlatform = "lib/dart_client.platform";
 const String _serverPlatform = "lib/dart_server.platform";
 const String _sharedPlatform = "lib/dart_shared.platform";
 
 const String _UNDETERMINED_BUILD_ID = "build number could not be determined";
 const bool _forceIncrementalSupport =
     const bool.fromEnvironment('DART2JS_EXPERIMENTAL_INCREMENTAL_SUPPORT');