Re-add missed files

pkg/analyzer/test/plugin/test_all.dart

Index: pkg/analyzer/test/plugin/test_all.dart
diff --git a/pkg/analyzer/test/instrumentation/test_all.dart b/pkg/analyzer/test/plugin/test_all.dart
similarity index 58%
copy from pkg/analyzer/test/instrumentation/test_all.dart
copy to pkg/analyzer/test/plugin/test_all.dart
index f9bfc2d9e4c3ee027f88b851b7077d8547513e46..e8b0ce35f217eeceb43cd8bea85a5115d6a9df11 100644
--- a/pkg/analyzer/test/instrumentation/test_all.dart
+++ b/pkg/analyzer/test/plugin/test_all.dart
@@ -2,16 +2,18 @@
 // 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 test.instrumentation.test_all;
+library test.plugin.all;
 
 import 'package:unittest/unittest.dart';
 
-import 'instrumentation_test.dart' as instrumentation_test;
+import 'plugin_impl_test.dart' as plugin_impl;
 
-/// Utility for manually running all tests.
+/**
+ * Utility for manually running all tests.
+ */
 main() {
   groupSep = ' | ';
-  group('instrumentation', () {
-    instrumentation_test.main();
+  group('plugins', () {
+    plugin_impl.main();
   });
 }