This has two benefits: - It is less likely that the macro will be copy-pasted around when unnecessary - We can drop `_LIBCPP_HIDE_FROM_ABI` from any member functions once we are able to make `_LIBCPP_HIDE_FROM_ABI` the default within libc++
This has two benefits: - It is less likely that the macro will be copy-pasted around when unnecessary - We can drop `_LIBCPP_HIDE_FROM_ABI` from any member functions once we are able to make `_LIBCPP_HIDE_FROM_ABI` the default within libc++