[RFA/commit/powerpc] breakpoint inserted past function end

[Joel Brobecker]

> gdb/ChangeLog:
> 
>         * rs6000-tdep.c (rs6000_skip_prologue): Make sure that the prologue
>         upper limit address is not greater than the function end address
>         when the upper limit could not be computed using the debugging
>         info.

Checked in.  Thanks again to Thiago for the testing...

-- 
Joel