cleanup patch generation to preseve comments and remove @patch

test/generated_sdk/lib/core/stopwatch.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
 part of dart.core;
 
 /**
  * A simple stopwatch interface to measure elapsed time.
  */
 class Stopwatch {
@@ skipping 116 matching lines @@
   /**
    * Returns wether the [StopWatch] is currently running.
    */
   bool get isRunning => _start != null && _stop == null;
 
   /**
    * Cached frequency of the system. Must be initialized in [_initTicker];
    */
   static int _frequency;
 
-  @patch
+  /**
+   * Initializes the time-measuring system. *Must* initialize the [_frequency]
+   * variable.
+   */
   static void _initTicker() {
     Primitives.initTicker();
     _frequency = Primitives.timerFrequency;
   }
-  @patch
   static int _now() => Primitives.timerTicks();
 }