Hard to tell what stage the bootstrap is on

[Paolo Bonzini]

> At the moment, we do this deliberately to preserve debug information.
> However, once libgcc is moved out of to top level - hopefully along
> with the gcc-provided include files - then gcc can be a pure host
> directory, and we won't need to worry about this.

Uhm, we'd still need to have prev-libgcc wouldn't we?  I'm not so 
positive that we can remove the prev-* thing entirely, though it's 
possible that it can be restricted to the target libraries...

Paolo