[Patch/RFC] libstdc++/19495

[Benjamin Kosnik]

Paolo, I think this is reasonable.

> For 4.1, or when the ABI can change, anyway, we can consider changing
> basic_string to make use of memory aligned only as CharT requires, not
> more, but, for the time being, the below seems to me a viable approach...
> 
> Opinions? Disagreements?

For so_7, we really need to come up with some changes for std::string.

For one, we have to have link-time differences for various Reps. It's
the only way we are going to be able to do shared allocation strings.

Anyway.

-benjamin