Stack checker broken on PowerPC/virtex BSP - 4.7.99.1 or later

[Chris Johns]

Joel Sherrill wrote:
>  
> I have done a lot of work on the stack checker since 4.7 was branched
> so it is possible something is broken but I did a lot of testing so think
> it is really ok.
> 

I have just tested the test for the stack checker on the pc586 under qemu with 
CVS head and the latest 4.8 tools and it seems ok.

Regards
Chris