Move pub into sdk/lib/_internal.

sdk/lib/_internal/pub/bin/pub.dart

Index: sdk/lib/_internal/pub/bin/pub.dart
diff --git a/tests/language/issue9602_other.dart b/sdk/lib/_internal/pub/bin/pub.dart
similarity index 66%
copy from tests/language/issue9602_other.dart
copy to sdk/lib/_internal/pub/bin/pub.dart
index a189b7759b4381e2a8a27289c2b7ca318915f85a..102465f784c2d814700c875d98ce7d4aa9468daa 100644
--- a/tests/language/issue9602_other.dart
+++ b/sdk/lib/_internal/pub/bin/pub.dart
@@ -2,9 +2,7 @@
 // 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.
 
-// Regression test case for http://dartbug.com/9602
-library issue9602_other;
+import '../lib/src/pub.dart';
 
-class M {
-  var _field;
-}
+// TODO(nweiz): move option-parsing logic into this file.
+void main() => run();