debug shrink_to_fit

[Paolo Carlini]

... the below is what I tested and I'm committing. Note that 
__shrink_to_fit_aux is actually not so simple: being the request non 
binding, we don't want to do anything if the type isn't copy 
constructible and the move constructor can throw, whereas, per se, 
move_if_noexcept would just move in that case. Also, I decided to open 
code the vector<bool> case, otherwise the generic code for vector would 
have copied bit-by-bit, horrible performance-wise.

Tested x86_64-linux.

Thanks,
Paolo.

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