Switch to aggresive promotion in mark-sweep collections.

src/mark-compact.cc

 // Copyright 2006-2008 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 1192 matching lines @@
   for (Address current = from_bottom; current < from_top; current += size) {
     HeapObject* object = HeapObject::FromAddress(current);
 
     if (object->IsMarked()) {
       object->ClearMark();
       MarkCompactCollector::tracer()->decrement_marked_count();
 
       size = object->Size();
       survivors_size += size;
 
-      if (Heap::ShouldBePromoted(current, size) &&
-          TryPromoteObject(object, size)) {
+      // Aggressively promote young survivors to the old space.
+      if (TryPromoteObject(object, size)) {
         continue;
       }
 
       // Promotion either failed or not required.
       // Copy the content of the object.
       Object* target = space->AllocateRaw(size);
 
       // Allocation cannot fail at this point: semispaces are of equal size.
       ASSERT(!target->IsFailure());
 
@@ skipping 985 matching lines @@
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (obj->IsCode()) {
     PROFILE(CodeDeleteEvent(obj->address()));
   } else if (obj->IsJSFunction()) {
     PROFILE(FunctionDeleteEvent(obj->address()));
   }
 #endif
 }
 
 } }  // namespace v8::internal