Christopher Di Bella c7ad020099 [libcxx] adds remaining callable concepts
* `std::predicate`
* `std::relation`
* `std::equivalence_relation`
* `std::strict_weak_order`

Implements parts of:
    - P0898R3 Standard Library Concepts
    - P1754 Rename concepts to standard_case for C++20, while we still can

Differential Revision: https://reviews.llvm.org/D96477
2021-04-07 16:14:45 +00:00
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