VM: Fix snapshoting slow-down caused by 99c6a18a1bc2a4f13d8dd027a597fdca0f2d6e0c.

runtime/bin/loader.cc

 // Copyright (c) 2016, 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.
 
 
 #include "bin/loader.h"
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
 #include "bin/extensions.h"
@@ skipping 122 matching lines @@
                   const char* packages_file,
                   const char* working_directory,
                   const char* root_script_uri) {
   // This port delivers loading messages to the service isolate.
   Dart_Port loader_port = Builtin::LoadPort();
   ASSERT(loader_port != ILLEGAL_PORT);
 
   // Keep in sync with loader.dart.
   const intptr_t _Dart_kInitLoader = 4;
 
-  Dart_Handle request = Dart_NewList(8);
+  Dart_Handle request = Dart_NewList(9);
   Dart_ListSetAt(request, 0, trace_loader ? Dart_True() : Dart_False());
   Dart_ListSetAt(request, 1, Dart_NewInteger(Dart_GetMainPortId()));
   Dart_ListSetAt(request, 2, Dart_NewInteger(_Dart_kInitLoader));
   Dart_ListSetAt(request, 3, Dart_NewSendPort(port_));
   Dart_ListSetAt(request, 4, (package_root == NULL)
                                  ? Dart_Null()
                                  : Dart_NewStringFromCString(package_root));
   Dart_ListSetAt(request, 5, (packages_file == NULL)
                                  ? Dart_Null()
                                  : Dart_NewStringFromCString(packages_file));
   Dart_ListSetAt(request, 6, Dart_NewStringFromCString(working_directory));
   Dart_ListSetAt(request, 7, (root_script_uri == NULL)
                                  ? Dart_Null()
                                  : Dart_NewStringFromCString(root_script_uri));
+  Dart_ListSetAt(request, 8, Dart_NewBoolean(Dart_IsReloading()));
+
 
   bool success = Dart_Post(loader_port, request);
   ASSERT(success);
 }
 
 
 void Loader::SendImportExtensionRequest(Dart_Handle url,
                                         Dart_Handle library_url) {
   // This port delivers loading messages to the service isolate.
   Dart_Port loader_port = Builtin::LoadPort();
@@ skipping 738 matching lines @@
   MutexLocker ml(loader_infos_lock_);
   Loader* loader = LoaderForLocked(dest_port_id);
   if (loader == NULL) {
     return;
   }
   loader->QueueMessage(message);
 }
 
 }  // namespace bin
 }  // namespace dart