Christopher Di Bella 8d4af1b6e0 [libcxx] adds concept std::regular
Implements parts of:
    - P0898R3 Standard Library Concepts
    - P1754 Rename concepts to standard_case for C++20, while we still can

Depends on D97911

Reviewed By: EricWF, #libc, Quuxplusone

Differential Revision: https://reviews.llvm.org/D98154
2021-03-12 08:54:03 -08:00
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