render tree destruction speedup

[Darin Adler]

On Oct 18, 2003, at 9:00 PM, Dirk Mueller wrote:

> I've been looking around and I think 
> RenderObject::removeFromObjectLists() could gain something from such a 
> check as well. I've applied it locally here and it survived initial 
> testing.

For changes like this, it's really useful to know how much it sped 
things up. Do you have any easy way of doing a speed test to see if 
adding the check to RenderObject::removeFromObjectLists() is a win or 
not?

     -- Darin