Add --noclever-optimizations to disable some things that have

src/mark-compact.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 698 matching lines @@
   //
   // Here we assume that if we change *p, we replace it with a heap object
   // (ie, the left substring of a cons string is always a heap object).
   //
   // The check performed is:
   //   object->IsConsString() && !object->IsSymbol() &&
   //   (ConsString::cast(object)->second() == HEAP->empty_string())
   // except the maps for the object and its possible substrings might be
   // marked.
   HeapObject* object = HeapObject::cast(*p);
+  if (!FLAG_clever_optimizations) return object;
   Map* map = object->map();
   InstanceType type = map->instance_type();
   if ((type & kShortcutTypeMask) != kShortcutTypeTag) return object;
 
   Object* second = reinterpret_cast<ConsString*>(object)->unchecked_second();
   Heap* heap = map->GetHeap();
   if (second != heap->empty_string()) {
     return object;
   }
 
@@ skipping 3073 matching lines @@
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 
 
 } }  // namespace v8::internal