Support --use-kernel in memory_compiler

tests/compiler/dart2js/kernel/literals_test.dart

 // Copyright (c) 2016, 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:test/test.dart';
 
 import 'helper.dart' show check;
 
 main() {
   test('compile function that returns a literal list', () {
     return check('main() { return [1, 2, 3]; }');
   });
   test('compile function that returns a const list', () {
     return check('main() { return const [1, 2, 3]; }');
   });
   test('compile function that returns a literal map', () {
-    return check('main() { return {"a": 1, "b": 2, "c": 3}; }');
+    return check('main() { return {"a": 1, "b": 2, "c": 3}; }',
+        useKernelInSsa: true);

[Siggi Cherem (dart-lang), 2017/08/23 20:45:18]

what about all the other check calls in this file?

[Johnni Winther, 2017/08/24 06:47:54]

They work with 'useKernel'.

[Siggi Cherem (dart-lang), 2017/08/24 15:32:15]

sorry - the `useKernel: false` in `compile` misled me to believe that both flags
were off. Makes sense now.

   });
   test('compile function that returns a const map', () {
     return check('main() { return const {"a": 1, "b": 2, "c": 3}; }');
   });
   test('compile top level string field ', () {
     return check('String foo = (() { return "a";})(); main() { return foo; }');
   });
 }