[libc++] Reorganize the std::variant macros (#89419) std::variant uses multiple macros to generate special member functions. These macros were very subtle to read because of e.g. a macro argument appearing in the middle of a macro-ized class definition. In conjunction with clang-format, this could lead to extremely subtle macro expansions that were not easy to parse for humans. By adding semi-colons in macro expansions in judicious places, clang-format does a better job and makes these macros a lot easier to read. As a drive-by fix, I noticed that several of these functions were missing HIDE_FROM_ABI annotations, so I added them.
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