[cpp-threads] Review comments on N2176 WRT dependency ordering

[Peter Dimov]

Peter Dimov wrote:

> Are they important enough? We can add a minimalistic index-based
> primitive along the lines of:
>
> template<class T, class U> inline U* atomic_load_index( T const * pi,
> U * base );

Or maybe you had in mind the other kind of indexing that we can support by 
adding an offset argument to atomic_load_address (defaulted to 0)?