Support use of dill in TypeEnv tests

tests/compiler/dart2js/kernel/compile_from_dill_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.
 
 // Helper to test compilation equivalence between source and .dill based
 // compilation.
 library dart2js.kernel.compile_from_dill_test_helper;
 
 import 'dart:async';
 
@@ skipping 269 matching lines @@
   if (collector.warnings.isNotEmpty && skipWarnings) {
     print('Skipping due to warnings.');
     return ResultKind.warnings;
   }
   Expect.isFalse(compiler1.compilationFailed);
   ClosedWorld closedWorld1 =
       compiler1.resolutionWorldBuilder.closedWorldForTesting;
 
   OutputCollector collector2 = new OutputCollector();
   Compiler compiler2 = await compileWithDill(
-      entryPoint, const {}, <String>[]..addAll(commonOptions)..addAll(options),
-      printSteps: true, compilerOutput: collector2);
+      entryPoint: entryPoint,
+      options: <String>[]..addAll(commonOptions)..addAll(options),
+      printSteps: true,
+      compilerOutput: collector2);
 
   KernelFrontEndStrategy frontendStrategy = compiler2.frontendStrategy;
   KernelToElementMap elementMap = frontendStrategy.elementMap;
 
   Expect.isFalse(compiler2.compilationFailed);
 
   KernelEquivalence equivalence1 = new KernelEquivalence(elementMap);
 
   ClosedWorld closedWorld2 =
       compiler2.resolutionWorldBuilder.closedWorldForTesting;
@@ skipping 61 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;
 }