[kernel] Support for top-level generic functions.

pkg/kernel/test/closures/suite.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.md file.
 
 library test.kernel.closures.suite;
 
 import 'dart:io' show File;
 
 import 'dart:async' show Future;
 
@@ skipping 85 matching lines @@
 class Run extends Step<Uri, int, ClosureConversionContext> {
   const Run();
 
   String get name => "run";
 
   Future<Result<int>> run(Uri uri, ClosureConversionContext context) async {
     final File generated = new File.fromUri(uri);
     try {
       Uri sdk = await computePatchedSdk();
       Uri vm = computeDartVm(sdk);
-      final StdioProcess process = await StdioProcess
-          .run(vm.toFilePath(), [generated.path, "Hello, World!"]);
+      final StdioProcess process = await StdioProcess.run(vm.toFilePath(), [
+        "--reify",
+        "--reify_generic_functions",
+        generated.path,
+        "Hello, World!"
+      ]);
       print(process.output);
       return process.toResult();
     } finally {
       generated.parent.delete(recursive: true);
     }
   }
 }
 
 main(List<String> arguments) => runMe(arguments, createContext, "testing.json");