ojhunt wrote:

> > I just noticed there's no documentation for 
> > `__builtin_virtual_member_address()` so I'm addressing that.
> > Due to code drift and time I realized that they disagree as to whether they 
> > should take `C*` or `C&` so I'm going to make them both accept either 
> > (existing code means we can't unify on one or the other, but also there's 
> > no real reason to not accept either and simply do the correct thing)
> 
> most of our builtins take pointers. Accepting both seems unwise. people might 
> want to do interesting things in sfinae context and if we accept everything 
> and anything it will end up causing more pain than it alleviates.

Hmmm, I'll revert to only supporting pointers in ``get_vtable_pointer`` but 
there's existing code dependent on the non-pointer argument to 
virtual_member_address which makes it difficult to switch to having a pointer 
argument.

https://github.com/llvm/llvm-project/pull/135469
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