Support unittest of jumps

tests/compiler/dart2js/inference/inference_test_helper.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 'package:compiler/src/common.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/elements/elements.dart';
 import 'package:compiler/src/elements/entities.dart';
 import 'package:compiler/src/tree/nodes.dart';
 import 'package:compiler/src/types/types.dart';
 
 import '../equivalence/id_equivalence.dart';
-import '../equivalence/id_equivalence_helper.dart';
 
 /// Compute type inference data for [_member] as a [MemberElement].
 ///
 /// Fills [actualMap] with the data and [sourceSpanMap] with the source spans
 /// for the data origin.
 void computeMemberAstTypeMasks(
     Compiler compiler, MemberEntity _member, Map<Id, ActualData> actualMap,
     {bool verbose: false}) {
   MemberElement member = _member;
   ResolvedAst resolvedAst = member.resolvedAst;
   if (resolvedAst.kind != ResolvedAstKind.PARSED) return;
   compiler.reporter.withCurrentElement(member.implementation, () {
     new TypeMaskComputer(compiler.reporter, actualMap, resolvedAst,
             compiler.globalInference.results)
         .run();
   });
 }
 
 /// AST visitor for computing inference data for a member.
-class TypeMaskComputer extends AbstractResolvedAstComputer {
+class TypeMaskComputer extends AstDataExtractor {
   final GlobalTypeInferenceResults results;
   final GlobalTypeInferenceElementResult result;
 
   TypeMaskComputer(DiagnosticReporter reporter, Map<Id, ActualData> actualMap,
       ResolvedAst resolvedAst, this.results)
       : result = results.resultOfMember(resolvedAst.element as MemberElement),
         super(reporter, actualMap, resolvedAst);
 
   @override
   String computeElementValue(AstElement element) {
@@ skipping 18 matching lines @@
   String computeNodeValue(Node node, [AstElement element]) {
     if (node is Send) {
       TypeMask value = result.typeOfSend(node);
       return value != null ? '$value' : null;
     } else if (element != null && element.isLocal) {
       return computeElementValue(element);
     }
     return null;
   }
 }