Recent libstdc++ regressions

[Paolo Carlini]

Hi,
> This is likely to have been my patch.
> I'm minimizing the check_construct_destroy failure right now.
> If someone could give me some idea of what is causing the execution
> failures while i do that, i may be able to fix them faster :)
>   
Thanks for fixing the check_construct_destroy problem.

I would suggest concentrating next on the vector/bool failure, which is 
about a standard feature, not an extension. Frankly, I don't have any 
special advice, the testcase is pretty straightforward...

Paolo.