Handle instance fields in compile_from_dill_test

tests/compiler/dart2js/kernel/compile_from_dill_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.
 
 // Partial test that the closed world computed from [WorldImpact]s derived from
 // kernel is equivalent to the original computed from resolution.
 library dart2js.kernel.compile_from_dill_test;
 
 import 'dart:async';
 import 'dart:io';
@@ skipping 17 matching lines @@
 import '../equivalence/check_helpers.dart';
 import '../serialization/helper.dart';
 import 'test_helpers.dart';
 
 import 'compiler_helper.dart';
 
 const SOURCE = const {
   'main.dart': '''
 foo() => 1;
 bar(a) => !a;
-class Class {}
+class Class {
+  int field;
+  Class();
+}
 main() {
   foo();
   bar(true);
   [];
   {};
   new Object();
   new Class();
   var x = null;
   return x;
 }
@@ skipping 119 matching lines @@
     }
     Map<String, BufferedOutputSink> map2 = collector2.outputMap[outputType];
     checkSets(map1.keys, map2.keys, 'output', equality);
     map1.forEach((String name, BufferedOutputSink output1) {
       BufferedOutputSink output2 = map2[name];
       Expect.stringEquals(output1.text, output2.text);
     });
   });
   return ResultKind.success;
 }