Move `analyzer_cli` into the SDK.

pkg/analyzer_cli/test/data/test_file.dart

Index: pkg/analyzer_cli/test/data/test_file.dart
diff --git a/tests/isolate/exit_at_spawnuri_iso.dart b/pkg/analyzer_cli/test/data/test_file.dart
similarity index 83%
copy from tests/isolate/exit_at_spawnuri_iso.dart
copy to pkg/analyzer_cli/test/data/test_file.dart
index 9bc892ee55a5886276c53ae4481ec2c1e49a9112..1ac3540f8cf07a42267eca31cac646fa9b1cccad 100644
--- a/tests/isolate/exit_at_spawnuri_iso.dart
+++ b/pkg/analyzer_cli/test/data/test_file.dart
@@ -2,6 +2,4 @@
 // 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.
 
-library exit_at_spawn_iso;
-
-main() {}
+library analyzer_cli.test.data.test_file;