Fix instanceof a function proxy.

src/runtime.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 8163 matching lines @@
   PropertyAttributes attr =
       static_cast<PropertyAttributes>(DONT_DELETE | DONT_ENUM | READ_ONLY);
   ForceSetProperty(bound_function, length_symbol, new_length, attr);
   return *bound_function;
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_BoundFunctionGetBindings) {
   HandleScope handles(isolate);
   ASSERT(args.length() == 1);
-  CONVERT_ARG_CHECKED(JSObject, callable, 0);
+  CONVERT_ARG_CHECKED(JSReceiver, callable, 0);
   if (callable->IsJSFunction()) {
     Handle<JSFunction> function = Handle<JSFunction>::cast(callable);
     if (function->shared()->bound()) {
       Handle<FixedArray> bindings(function->function_bindings());
       ASSERT(bindings->map() == isolate->heap()->fixed_cow_array_map());
       return *isolate->factory()->NewJSArrayWithElements(bindings);
     }
   }
   return isolate->heap()->undefined_value();
 }
@@ skipping 5376 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags);
   }
 }
 
 
 } }  // namespace v8::internal