Added full deferred loading semantic to precompiled/--noopt/eager-loading code

runtime/lib/object.cc

 // Copyright (c) 2011, 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/bootstrap_natives.h"
 
 #include "lib/invocation_mirror.h"
 #include "vm/code_patcher.h"
 #include "vm/exceptions.h"
 #include "vm/heap.h"
@@ skipping 360 matching lines @@
       LibraryPrefix::CheckedHandle(arguments->NativeArgAt(0));
   // Currently all errors are Dart instances, e.g. I/O errors
   // created by deferred loading code. LanguageErrors from
   // failed loading or finalization attempts are propagated and result
   // in the isolate's death.
   const Instance& error = Instance::Handle(prefix.LoadError());
   return error.raw();
 }
 
 
+DEFINE_NATIVE_ENTRY(LibraryPrefix_isLoaded, 1) {
+  const LibraryPrefix& prefix =
+      LibraryPrefix::CheckedHandle(arguments->NativeArgAt(0));
+  return Bool::Get(prefix.is_loaded()).raw();
+}
+
+
 DEFINE_NATIVE_ENTRY(Internal_inquireIs64Bit, 0) {
 #if defined(ARCH_IS_64_BIT)
   return Bool::True().raw();
 #else
   return Bool::False().raw();
 #endif  // defined(ARCH_IS_64_BIT)
 }
 
 }  // namespace dart