debug mode performance patch

[François Dumont]

On 11/02/2010 11:17 AM, Paolo Carlini wrote:
> This morning I wondered if we could learn something from this work,
> which we have been able to apply without breaking the binary compatibility:
>
>      http://gcc.gnu.org/ml/libstdc++/2007-06/msg00017.html
>
> (see also the ensuing exchanges until the final commit in October,
> 2007). Maybe Jakub is willing to have a look too, I'm adding him in CC.
>
> As a minor nit, I see some unuglified names, like transfered_iterators.
>    

Ok, I will take care of it and resubmit the patch before the end of the 
week.

François