Store the async-await compiled pub code directly in the repo.

sdk/lib/_internal/pub_generated/test/global/activate/empty_constraint_test.dart

Index: sdk/lib/_internal/pub_generated/test/global/activate/empty_constraint_test.dart
diff --git a/sdk/lib/_internal/pub/test/global/activate/empty_constraint_test.dart b/sdk/lib/_internal/pub_generated/test/global/activate/empty_constraint_test.dart
similarity index 61%
copy from sdk/lib/_internal/pub/test/global/activate/empty_constraint_test.dart
copy to sdk/lib/_internal/pub_generated/test/global/activate/empty_constraint_test.dart
index c1f6f0268a5f7f031ceb49e4d87e992b5eba5b3b..3101c4ed113c416748a2ac9117d8629718e84f38 100644
--- a/sdk/lib/_internal/pub/test/global/activate/empty_constraint_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/global/activate/empty_constraint_test.dart
@@ -1,10 +1,5 @@
-// Copyright (c) 2014, 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 '../../../lib/src/exit_codes.dart' as exit_codes;
 import '../../test_pub.dart';
-
 main() {
   initConfig();
   integration('errors if the constraint matches no versions', () {
@@ -12,9 +7,7 @@ main() {
       builder.serve("foo", "1.0.0");
       builder.serve("foo", "1.0.1");
     });
-
-    schedulePub(args: ["global", "activate", "foo", ">1.1.0"],
-        error: """
+    schedulePub(args: ["global", "activate", "foo", ">1.1.0"], error: """
             Package foo has no versions that match >1.1.0 derived from:
             - pub global activate depends on version >1.1.0""",
         exitCode: exit_codes.DATA);