Nikolas Klauser 20a11cb550 [libc++] Fix algorithms which use reverse_iterator
This adds a C++20-version of `reverse_iterator` which doesn't SFINAE away the operators for use inside the classic STL algorithms. Pre-C++20 `_AlgRevIter` is just an alias for `reverse_iterator`.

Reviewed By: var-const, #libc

Spies: huixie90, libcxx-commits

Differential Revision: https://reviews.llvm.org/D128864
2022-07-25 18:35:20 +02:00
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