Mikhail Maltsev d8f3cdfed0 [libcxx] Implement three-way comparison for std::reverse_iterator
This patch implements operator<=> for std::reverse_iterator and
also adds a test that checks that three-way comparison of different
instantiations of std::reverse_iterator works as expected (related to
D113417).

Reviewed By: ldionne, Quuxplusone, #libc

Differential Revision: https://reviews.llvm.org/D113695
2021-11-26 10:12:19 +00:00
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