Switch code flushing to use different JSFunction field.

src/runtime.cc

 // Copyright 2012 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 2236 matching lines @@
 
   // Since we don't store the source we should never optimize this.
   target_shared->code()->set_optimizable(false);
 
   // Clear the optimization hints related to the compiled code as these
   // are no longer valid when the code is overwritten.
   target_shared->ClearThisPropertyAssignmentsInfo();
 
   // Set the code of the target function.
   target->ReplaceCode(source_shared->code());
+  ASSERT(target->next_function_link()->IsUndefined());
 
   // Make sure we get a fresh copy of the literal vector to avoid cross
   // context contamination.
   Handle<Context> context(source->context());
   int number_of_literals = source->NumberOfLiterals();
   Handle<FixedArray> literals =
       isolate->factory()->NewFixedArray(number_of_literals, TENURED);
   if (number_of_literals > 0) {
     literals->set(JSFunction::kLiteralNativeContextIndex,
                   context->native_context());
   }
   target->set_context(*context);
   target->set_literals(*literals);
-  target->set_next_function_link(isolate->heap()->undefined_value());
 
   if (isolate->logger()->is_logging_code_events() ||
       CpuProfiler::is_profiling(isolate)) {
     isolate->logger()->LogExistingFunction(
         source_shared, Handle<Code>(source_shared->code()));
   }
 
   return *target;
 }
 
@@ skipping 10998 matching lines @@
     // 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,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal