remove unused imports

pkg/compiler/lib/src/ssa/locals_handler.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.
 
 import '../closure.dart';
 import '../common.dart';
 import '../elements/resolution_types.dart';
 import '../elements/elements.dart';
 import '../elements/entities.dart';
 import '../io/source_information.dart';
-import '../js/js.dart' as js;
 import '../js_backend/native_data.dart';
 import '../js_backend/interceptor_data.dart';
-import '../native/native.dart' as native;
 import '../tree/tree.dart' as ast;
 import '../types/types.dart';
 import '../world.dart' show ClosedWorld;
 
 import 'graph_builder.dart';
 import 'nodes.dart';
 import 'types.dart';
 
 /// Keeps track of locals (including parameters and phis) when building. The
 /// 'this' reference is treated as parameter and hence handled by this class,
@@ skipping 649 matching lines @@
   final int hashCode = _nextHashCode = (_nextHashCode + 1).toUnsigned(30);
   static int _nextHashCode = 0;
 
   SyntheticLocal(this.name, this.executableContext);
 
   @override
   MemberElement get memberContext => executableContext.memberContext;
 
   toString() => 'SyntheticLocal($name)';
 }