VM: [Kernel] Fix bootstraping when Kernel isolate is used.

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 16 matching lines @@
       error_(Dart_Null()),
       monitor_(NULL),
       pending_operations_(0),
       results_(NULL),
       results_length_(0),
       results_capacity_(0),
       payload_(NULL),
       payload_length_(0) {
   monitor_ = new Monitor();
   ASSERT(isolate_data_ != NULL);
-  port_ = Dart_NewNativePort("Loader", Loader::NativeMessageHandler, false);
+  port_ =
+      Dart_NewNativePort("Loader", Loader::NativeMessageHandler, false, this);
   isolate_data_->set_loader(this);
   AddLoader(port_, isolate_data_);
 }
 
 
 Loader::~Loader() {
   ASSERT(port_ != ILLEGAL_PORT);
   // Enter the monitor while we close the Dart port. After the Dart port is
   // closed, no more results can be queued.
   monitor_->Enter();
@@ skipping 762 matching lines @@
 }
 
 
 Loader* Loader::LoaderFor(Dart_Port port) {
   MutexLocker ml(loader_infos_lock_);
   return LoaderForLocked(port);
 }
 
 
 void Loader::NativeMessageHandler(Dart_Port dest_port_id,
-                                  Dart_CObject* message) {
+                                  Dart_CObject* message,
+                                  void* peer) {
   MutexLocker ml(loader_infos_lock_);
-  Loader* loader = LoaderForLocked(dest_port_id);
-  if (loader == NULL) {
-    return;
-  }
-  loader->QueueMessage(message);
+  static_cast<Loader*>(peer)->QueueMessage(message);
 }
 
 }  // namespace bin
 }  // namespace dart