bemanproject / utf_view / 25712895209

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Replace iterator's back-pointer with previous three-iterator design

After considering the fact that views::adjacent<N> means that the
library has precedent for views whose iterators contain multiple
iterators from the base view, and the fact that, since R10 broke
.base() consistency to implement the double-transcode optimization, we
no longer need the innermost-iterator machinery, I realized that it
was possible to restore the three-iterator design from P2728R7 and
before, and with it, the borrowedness of the view.

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