[SH] Adjust stack area for simulator

[Nick Clifton]

Hi Oleg,

> ld/ChangeLog:
> 	* emulparams/shelf.sh: Set stack area to 0x3FFFFF00.

This part is approved.  Do you have write access ?  If not, 
then ping me and I will apply the patch for you.


> sim/ChangeLog:
> 	* sh/interp.c (sim_memory_size): Default init to 30.
> 	(parse_and_set_memory_size): Adjust upper bound to 31.
> 

This part of the patch needs to be posted to the gdb list and approval sort there.

Cheers
  Nick