Fix assertion in Dartium loading

runtime/vm/object.cc

 // 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.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 8395 matching lines @@
 
 
 void Library::SetLoaded() const {
   // Should not be already loaded or just allocated.
   ASSERT(LoadInProgress() || LoadRequested());
   raw_ptr()->load_state_ = RawLibrary::kLoaded;
 }
 
 
 void Library::SetLoadError() const {
-  // Should not be already loaded or just allocated.
-  ASSERT(LoadInProgress() || LoadRequested());
+  // Should not be already successfully loaded or just allocated.
+  ASSERT(LoadInProgress() || LoadRequested() || LoadError());
   raw_ptr()->load_state_ = RawLibrary::kLoadError;
 }
 
 
 static RawString* MakeClassMetaName(const Class& cls) {
   String& cname = String::Handle(cls.Name());
   return String::Concat(Symbols::At(), cname);
 }
 
 
@@ skipping 10580 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart