Move locals and closure classes from kernel/ to js_model/

tests/compiler/dart2js/closure/closure_test.dart

 // Copyright (c) 2017, 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 'dart:io';
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/src/closure.dart';
 import 'package:compiler/src/common.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/diagnostics/diagnostic_listener.dart';
 import 'package:compiler/src/elements/elements.dart';
 import 'package:compiler/src/elements/entities.dart';
 import 'package:compiler/src/kernel/element_map.dart';
 import 'package:compiler/src/kernel/kernel_backend_strategy.dart';
+import 'package:compiler/src/js_model/locals.dart';
 import 'package:compiler/src/tree/nodes.dart' as ast;
 import '../equivalence/id_equivalence.dart';
 import '../equivalence/id_equivalence_helper.dart';
 import 'package:kernel/ast.dart' as ir;
 
 main() {
   asyncTest(() async {
     Directory dataDir = new Directory.fromUri(Platform.script.resolve('data'));
     await for (FileSystemEntity entity in dataDir.list()) {
       print('Checking ${entity.uri}');
@@ skipping 102 matching lines @@
 
 /// Compute a string representation of the data stored for [local] in [info].
 String computeLocalValue(ClosureRepresentationInfo info, Local local) {
   StringBuffer sb = new StringBuffer();
   if (info.variableIsUsedInTryOrSync(local)) {
     sb.write('inTry');
   }
   // TODO(johnniwinther,efortuna): Add more info (captured, boxed etc.).
   return sb.toString();
 }