Fixes for issues

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/dfe.h"
 #include "bin/extensions.h"
@@ skipping 661 matching lines @@
   Dart_Handle result = Dart_StringToCString(url, &url_string);
   if (Dart_IsError(result)) {
     return result;
   }
   if (tag == Dart_kKernelTag) {
     ASSERT(dfe.UseDartFrontend() || dfe.kernel_file_specified());
     Dart_Isolate current = Dart_CurrentIsolate();
     ASSERT(!Dart_IsServiceIsolate(current) && !Dart_IsKernelIsolate(current));
     return dfe.ReadKernelBinary(current, url_string);
   }
-  ASSERT(!dfe.UseDartFrontend() && !dfe.kernel_file_specified());
+  ASSERT(Dart_IsKernelIsolate(Dart_CurrentIsolate()) ||
+         (!dfe.UseDartFrontend() && !dfe.kernel_file_specified()));
   if (tag != Dart_kScriptTag) {
     // Special case for handling dart: imports and parts.
     // Grab the library's url.
     Dart_Handle library_url = Dart_LibraryUrl(library);
     if (Dart_IsError(library_url)) {
       return library_url;
     }
     const char* library_url_string = NULL;
     result = Dart_StringToCString(library_url, &library_url_string);
     if (Dart_IsError(result)) {
@@ skipping 234 matching lines @@
   MutexLocker ml(loader_infos_lock_);
   Loader* loader = LoaderForLocked(dest_port_id);
   if (loader == NULL) {
     return;
   }
   loader->QueueMessage(message);
 }
 
 }  // namespace bin
 }  // namespace dart