Make the GC aware of JSReceiver pointers in LookupResults.

src/isolate.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 80 matching lines @@
   js_entry_sp_ = NULL;
   external_callback_ = NULL;
   current_vm_state_ = EXTERNAL;
   try_catch_handler_address_ = NULL;
   context_ = NULL;
   thread_id_ = ThreadId::Invalid();
   external_caught_exception_ = false;
   failed_access_check_callback_ = NULL;
   save_context_ = NULL;
   catcher_ = NULL;
+  top_lookup_result_ = NULL;
 
   // These members are re-initialized later after deserialization
   // is complete.
   pending_exception_ = NULL;
   has_pending_message_ = false;
   pending_message_obj_ = NULL;
   pending_message_script_ = NULL;
   scheduled_exception_ = NULL;
 }
 
@@ skipping 362 matching lines @@
        block != NULL;
        block = TRY_CATCH_FROM_ADDRESS(block->next_)) {
     v->VisitPointer(BitCast<Object**>(&(block->exception_)));
     v->VisitPointer(BitCast<Object**>(&(block->message_)));
   }
 
   // Iterate over pointers on native execution stack.
   for (StackFrameIterator it(this, thread); !it.done(); it.Advance()) {
     it.frame()->Iterate(v);
   }
+
+  // Iterate pointers in live lookup results.
+  thread->top_lookup_result_->Iterate(v);
 }
 
 
 void Isolate::Iterate(ObjectVisitor* v) {
   ThreadLocalTop* current_t = thread_local_top();
   Iterate(v, current_t);
 }
 
 
 void Isolate::RegisterTryCatchHandler(v8::TryCatch* that) {
@@ skipping 1393 matching lines @@
 
 #ifdef DEBUG
 #define ISOLATE_FIELD_OFFSET(type, name, ignored)                       \
 const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_);
 ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
 ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
 #undef ISOLATE_FIELD_OFFSET
 #endif
 
 } }  // namespace v8::internal