Properly handle instantiator when allocating or cloning closure instance.

runtime/lib/function.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/bootstrap_natives.h"
 
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/exceptions.h"
 #include "vm/native_entry.h"
@@ skipping 58 matching lines @@
   const Closure& receiver =
       Closure::CheckedHandle(zone, arguments->NativeArgAt(0));
   const Function& func = Function::Handle(receiver.function());
   return func.GetClosureHashCode();
 }
 
 
 DEFINE_NATIVE_ENTRY(Closure_clone, 1) {
   const Closure& receiver =
       Closure::CheckedHandle(zone, arguments->NativeArgAt(0));
+  const TypeArguments& instantiator =
+      TypeArguments::Handle(zone, receiver.instantiator());
   const Function& func = Function::Handle(zone, receiver.function());
   const Context& ctx = Context::Handle(zone, receiver.context());
   Context& cloned_ctx =
       Context::Handle(zone, Context::New(ctx.num_variables()));
   cloned_ctx.set_parent(Context::Handle(zone, ctx.parent()));
   Object& inst = Object::Handle(zone);
   for (int i = 0; i < ctx.num_variables(); i++) {
     inst = ctx.At(i);
     cloned_ctx.SetAt(i, inst);
   }
-  return Closure::New(func, cloned_ctx);
+  return Closure::New(instantiator, func, cloned_ctx);
 }
 
 
 }  // namespace dart