Support enabling of type inference with useKernel

tests/compiler/dart2js/equivalence/id_equivalence_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/commandline_options.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/resolution/access_semantics.dart';
 import 'package:compiler/src/resolution/send_structure.dart';
 import 'package:compiler/src/tree/nodes.dart' as ast;
@@ skipping 10 matching lines @@
 
 main() {
   asyncTest(() async {
     for (String path in dataDirectories) {
       Directory dataDir = new Directory.fromUri(Platform.script.resolve(path));
       await for (FileSystemEntity entity in dataDir.list()) {
         print('Checking ${entity.uri}');
         String annotatedCode =
             await new File.fromUri(entity.uri).readAsString();
         IdData data1 = await computeData(
-            annotatedCode, computeAstMemberData, compileFromSource);
+            annotatedCode, computeAstMemberData, compileFromSource,
+            options: [Flags.disableTypeInference]);
         IdData data2 = await computeData(
-            annotatedCode, computeIrMemberData, compileFromDill);
+            annotatedCode, computeIrMemberData, compileFromDill,
+            options: [Flags.disableTypeInference]);
         data1.actualMap.forEach((Id id, ActualData actualData1) {
           String value1 = actualData1.value;
           String value2 = data2.actualMap[id]?.value;
           if (value1 != value2) {
             reportHere(data1.compiler.reporter, actualData1.sourceSpan,
                 '$id: from source:${value1},from dill:${value2}');
             print('--annotations diff----------------------------------------');
             print(data1.computeDiffCodeFor(data2));
             print('----------------------------------------------------------');
           }
@@ skipping 170 matching lines @@
       return gotoName;
     }
     return '<unknown:$node (${node.runtimeType})>';
   }
 
   @override
   String computeMemberValue(ir.Member member) {
     return computeMemberName(member.enclosingClass?.name, member.name.name);
   }
 }