[v3] Speed-up ctype::do_is(mask, wchar_t) in the common case

[Paolo Carlini]

Hi,

the below is what I'm going to commit after further testing for this
performance issue, explained on the libstdc++-v3 mailing list. Wrt the
preliminary patch posted there I'm also improving the treatment of the
other elementary masks, besides ctype_base::space.

Tested x86-linux.

Paolo.

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