std::optional::value => operator*/operator-> value() has undesired exception checking semantics and calls __throw_bad_optional_access in libc++. Moreover, the API is unavailable without _LIBCPP_NO_EXCEPTIONS on older Mach-O platforms (see _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS). This fixes check-llvm. GitOrigin-RevId: 67ba5c507af2264ff79e4948b976477929436e86