Fix some assertion failures on Fuchsia

runtime/bin/isolate_data.h

 // 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.
 
 #ifndef RUNTIME_BIN_ISOLATE_DATA_H_
 #define RUNTIME_BIN_ISOLATE_DATA_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/globals.h"
@@ skipping 50 matching lines @@
     packages_file = strdup(packages_file_);
   }
 
   // While loading a loader is associated with the isolate.
   bool HasLoader() const { return loader_ != NULL; }
   Loader* loader() const {
     ASSERT(loader_ != NULL);
     return loader_;
   }
   void set_loader(Loader* loader) {
+#ifndef TARGET_OS_FUCHSIA

[zra, 2017/04/26 15:52:20]

#if !defined(TARGET_OS_FUCHSIA)

+    // TODO(29458): Enable on Fuchsia.
     ASSERT((loader_ == NULL) || (loader == NULL));
+#endif
     loader_ = loader;
   }
   MallocGrowableArray<char*>* dependencies() const { return dependencies_; }
   void set_dependencies(MallocGrowableArray<char*>* deps) {
     dependencies_ = deps;
   }
 
   void OnIsolateShutdown();
 
  private:
   Dart_Handle builtin_lib_;
   Loader* loader_;
   AppSnapshot* app_snapshot_;
   MallocGrowableArray<char*>* dependencies_;
 
   DISALLOW_COPY_AND_ASSIGN(IsolateData);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // RUNTIME_BIN_ISOLATE_DATA_H_