Make some VM libraries patch cleanly using the analyzer.

runtime/lib/isolate_patch.dart

 // Copyright (c) 2012, 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.
 
 import "dart:collection" show HashMap;
 import "dart:_internal";
 
 @patch class ReceivePort {
   @patch factory ReceivePort() = _ReceivePortImpl;
 
@@ skipping 59 matching lines @@
 
   close() {
     _rawPort.close();
     _controller.close();
   }
 
   final RawReceivePort _rawPort;
   StreamController _controller;
 }
 
-typedef void ImmediateCallback();
+typedef void _ImmediateCallback();
 
 /// The callback that has been registered through `scheduleImmediate`.
-ImmediateCallback _pendingImmediateCallback;
+_ImmediateCallback _pendingImmediateCallback;
 
 /// The closure that should be used as scheduleImmediateClosure, when the VM
 /// is responsible for the event loop.
 void _isolateScheduleImmediate(void callback()) {
   assert(_pendingImmediateCallback == null);
   _pendingImmediateCallback = callback;
 }
 
 void _runPendingImmediateCallback() {
   if (_pendingImmediateCallback != null) {
     var callback = _pendingImmediateCallback;
     _pendingImmediateCallback = null;
     callback();
   }
 }
 
-ImmediateCallback _removePendingImmediateCallback() {
+_ImmediateCallback _removePendingImmediateCallback() {
   var callback = _pendingImmediateCallback;
   _pendingImmediateCallback = null;
   return callback;
 }
 
 /// The embedder can execute this function to get hold of
 /// [_isolateScheduleImmediate] above.
 Function _getIsolateScheduleImmediateClosure() {
   return _isolateScheduleImmediate;
 }
@@ skipping 467 matching lines @@
     try {
       return Uri.parse(_getCurrentRootUriStr());
     } catch (e, s) {
       return null;
     }
   }
 
   static String _getCurrentRootUriStr()
       native "Isolate_getCurrentRootUriStr";
 }