Roll Observatory packages and add a roll script

packages/analyzer/lib/src/generated/utilities_collection.dart

Index: packages/analyzer/lib/src/generated/utilities_collection.dart
diff --git a/analyzer/lib/src/generated/utilities_collection.dart b/packages/analyzer/lib/src/generated/utilities_collection.dart
similarity index 99%
rename from analyzer/lib/src/generated/utilities_collection.dart
rename to packages/analyzer/lib/src/generated/utilities_collection.dart
index e8abbbd1e83d2781df568c9e5b23baf529889692..0d2afe8a49890538ee17d82b6f86bae5c47426ea 100644
--- a/analyzer/lib/src/generated/utilities_collection.dart
+++ b/packages/analyzer/lib/src/generated/utilities_collection.dart
@@ -2,9 +2,6 @@
 // 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.
 
-// This code was auto-generated, is not intended to be edited, and is subject to
-// significant change. Please see the README file for more information.
-
 library engine.utilities.collection;
 
 import "dart:math" as math;