explicit saves vs clobbers in paravirt.h

[jeremy at goop.org (Jeremy Fitzhardinge)]

Andi Kleen wrote:
> It's even better because we currently can't annotate explicit push/pop
> for the dwarf2 stack unwinder, and it would cause fallbacks to the
> old inexact unwinder.
>   
I guess they also clobber "cc", right?

    J