[RS6000] Fix PR12817

[Alan Modra]

On Sat, Nov 27, 2004 at 10:30:00AM +1030, Alan Modra wrote:
> The main question of course, is whether r11 is free to use at that point
> for all ABIs.  I reckon it is, and I've looked carefully.

I forgot something. :-(  r11 is used as the static chain, so this would
break nested functions.  r0 is free though, so I've updated the patch
accordingly.

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre