Roll Observatory packages and add a roll script

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

Index: packages/analyzer/lib/src/generated/utilities_general.dart
diff --git a/analyzer/lib/src/generated/utilities_general.dart b/packages/analyzer/lib/src/generated/utilities_general.dart
similarity index 94%
rename from analyzer/lib/src/generated/utilities_general.dart
rename to packages/analyzer/lib/src/generated/utilities_general.dart
index 62f40293d286a7a2c6c8e935809ebd6a8944c51f..d120a81abdd6e0a9b12554d53bbb5c556f21071f 100644
--- a/analyzer/lib/src/generated/utilities_general.dart
+++ b/packages/analyzer/lib/src/generated/utilities_general.dart
@@ -2,12 +2,9 @@
 // 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.general;
 
-import 'dart:profiler';
+import 'dart:developer' show UserTag;
 
 /**
  * Jenkins hash function, optimized for small integers.
@@ -36,7 +33,7 @@ class JenkinsSmiHash {
 
 /**
  * Helper class for gathering performance statistics.  This class is modeled on
- * the UserTag class in dart:profiler so that it can interoperate easily with
+ * the UserTag class in dart:developer so that it can interoperate easily with
  * it.
  */
 abstract class PerformanceTag {