[Patch] Fix adjacent_difference in parallel-mode

[Paolo Carlini]

Hi all, hi Johannes,

today I run again after some time check-parallel and one or more (don't
remember now, sorry) adjacent_difference tests failed, because of typos
introduce by the uglification, as far as I can see. I would ask you,
however, to go again through for_each_selectors.h, because the mix of
first vs _M_first and second vs _M_second (see, for example
__transform1_selector vs __transform2_selector) makes me a little
nervous... Consider any further simple fixes in this area pre-approved,
of course.

Thanks,
Paolo.

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