[v3] mt_allocator performance improvements

[Benjamin Kosnik]

Nice catch Paolo!

> >      // Return this block to our list and update counters and
> >      // owner id as needed.
> > -    --__bin._M_used[__block->_M_thread_id];
> > +    --__thread_bin._M_used;
> >    
> 
> 
> Changed that line to:
> --_M_thread_bin[__block->_M_thread_id][__which]._M_used;

I'm testing this patch, as attached. It looks to be correct to me. I'll
check it in if the tests are ok.

-benjamin
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