[libc++] Refactor __debug_three_way_comp This makes __debug_three_way_comp consistent with __debug_less and in particular gets rid of a potential use-after-move caused by the use of std::forward. In the previous version of the code, we would call `__do_compare_assert` after forwarding the arguments into the comparator, which could end up using the arguments after they've been moved from. This also simplifies how we call `__do_compare_assert` by using `if constexpr` and adds a missing test for proxy iterators in lexicographical_compare_three_way, which could have found this issue. Differential Revision: https://reviews.llvm.org/D152753
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