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Re: debug shrink_to_fit

... 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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Attachment: CL_shrink_to_fit_debug
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Attachment: patch_shrink_to_fit_debug
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