RFC: Speeding up libstdc++.so with --dynamic-list-data

[Paolo Bonzini]

> I am testing this patch now. It should fix the regresions when
> libstdc++ is built with
> 
> -Bsymbolic-functions --dynamic-list-cpp-new

What about just --dynamic-list-cpp that enables the new behavior and 
implies --dynamic-list-cpp-typeinfo (I know that it is useless in this 
particular case, since C++ typeinfo is data, but in general such an 
option sounds more useful than only --dynamic-list-cpp-new).

Paolo