Compute KernelClosureRepresentationInfo.variableIsUsedInTryOrSync

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/compiler.dart';
 import 'package:compiler/src/diagnostics/diagnostic_listener.dart';
 import 'package:compiler/src/elements/elements.dart';
 import 'package:compiler/src/tree/nodes.dart';
 import '../equivalence/id_equivalence.dart';
 import '../equivalence/id_equivalence_helper.dart';
 
 main() {
   asyncTest(() async {
     Directory dataDir = new Directory.fromUri(Platform.script.resolve('data'));
     await for (FileSystemEntity entity in dataDir.list()) {
       print('Checking ${entity.uri}');
       String annotatedCode = await new File.fromUri(entity.uri).readAsString();
       await checkCode(annotatedCode, checkClosureData);
     }
   });
 }
 
 void checkClosureData(
     Compiler compiler, Map<Id, String> expectedMap, MemberElement member) {
   new ClosureChecker(compiler.reporter, expectedMap, member.resolvedAst,
-          compiler.closureDataLookup as ClosureDataLookup<Node>)
+          compiler.backendStrategy.closureDataLookup as ClosureDataLookup<Node>)
       .check();
 }
 
 class ClosureChecker extends AbstractResolvedAstChecker {
   final ClosureDataLookup<Node> closureDataLookup;
   final ClosureRepresentationInfo info;
 
   ClosureChecker(DiagnosticReporter reporter, Map<Id, String> expectedMap,
       ResolvedAst resolvedAst, this.closureDataLookup)
       : this.info =
@@ skipping 11 matching lines @@
       return sb.toString();
     }
     return null;
   }
 
   @override
   String computeElementValue(AstElement element) {
     return null;
   }
 }