array bounds violation in caller-save.c : duplicate hard regs check added

[Hans-Peter Nilsson]

On Fri, 25 May 2012, DJ Delorie wrote:
> If I apply this patch, which checks for duplicate hard registers within
> -fira-share-save-slots, the following *-elf targets fail due to the assert:
>
> 	bfin cris m32c rl78 rx sh sh64 v850

Oop.  An no clue as to what's wrong.

Can you pretty please make the test-case n'all sent
down-thread into a PR?

brgds, H-P