Prepare inference test for kernel based inference

tests/compiler/dart2js/equivalence/id_equivalence_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 'dart:async';
+import 'dart:io';
+
 import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/common.dart';
 import 'package:compiler/src/common_elements.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/elements/entities.dart';
 import 'package:expect/expect.dart';
 
 import '../annotated_code_helper.dart';
 import '../memory_compiler.dart';
 import '../equivalence/id_equivalence.dart';
@@ skipping 142 matching lines @@
             .spanFromSpannable(
                 computeSpannable(elementEnvironment, mainUri, id))
             .begin;
         annotations[offset] = '--- | ${data2.value}';
       }
     });
     return withAnnotations(annotations);
   }
 }
 
+/// Check code for all test files int [data] using [computeFromAst] and
+/// [computeFromKernel] from the respective front ends. If [skipForKernel]
+/// contains the name of the test file it isn't tested for kernel.
+Future checkTests(Directory dataDir, ComputeMemberDataFunction computeFromAst,
+    ComputeMemberDataFunction computeFromKernel,
+    {List<String> skipForKernel: const <String>[], bool verbose: false}) async {
+  await for (FileSystemEntity entity in dataDir.list()) {
+    print('----------------------------------------------------------------');
+    print('Checking ${entity.uri}');
+    print('----------------------------------------------------------------');
+    String annotatedCode = await new File.fromUri(entity.uri).readAsString();
+    print('--from ast------------------------------------------------------');
+    await checkCode(annotatedCode, computeFromAst, compileFromSource,
+        verbose: verbose);
+    if (skipForKernel.contains(entity.uri.pathSegments.last)) {
+      print('--skipped for kernel------------------------------------------');
+      continue;
+    }
+    print('--from kernel---------------------------------------------------');
+    await checkCode(annotatedCode, computeFromKernel, compileFromDill,
+        verbose: verbose);
+  }
+}
+
 /// Compiles the [annotatedCode] with the provided [options] and calls
 /// [computeMemberData] for each member. The result is checked against the
 /// expected data derived from [annotatedCode].
 Future checkCode(
     String annotatedCode,
     ComputeMemberDataFunction computeMemberData,
     CompileFunction compileFunction,
     {List<String> options: const <String>[],
     bool verbose: false}) async {
   IdData data = await computeData(
@@ skipping 71 matching lines @@
       id = new NodeId(annotation.offset);
       expected = text;
     } else {
       id = new ElementId(text.substring(0, colonPos));
       expected = text.substring(colonPos + 1);
     }
     map[id] = expected;
   }
   return map;
 }