[Bug libstdc++/101589] Incorrect implementation of LWG 3533 for elements_view

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101589

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Patrick Palka
<ppalka@gcc.gnu.org>:

https://gcc.gnu.org/g:d187dfbd038a9be68ceb81a6ce4125d50cb453f9

commit r11-9131-gd187dfbd038a9be68ceb81a6ce4125d50cb453f9
Author: Patrick Palka <ppalka@redhat.com>
Date:   Mon Aug 2 15:30:13 2021 -0400

    libstdc++: Fix up implementation of LWG 3533 [PR101589]

    In r12-569 I accidentally applied the LWG 3533 change to
    elements_view::iterator::base instead to elements_view::base.

    This patch corrects this, and also applies the corresponding LWG 3533
    change to lazy_split_view::inner-iter::base now that we implement P2210.

            PR libstdc++/101589

    libstdc++-v3/ChangeLog:

            * include/std/ranges (lazy_split_view::_InnerIter::base): Make
            the const& overload unconstrained and return a const reference
            as per LWG 3533.  Make unconditionally noexcept.
            (elements_view::base): Revert accidental r12-569 change.
            (elements_view::_Iterator::base): Make the const& overload
            unconstrained and return a const reference as per LWG 3533.
            Make unconditionally noexcept.

    (cherry picked from commit 4414057186b227edf5b5efa527732bfcdf39d575)