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

[DJ Delorie]

> Date: Tue, 5 Jun 2012 21:59:15 -0400 (EDT)
> From: Hans-Peter Nilsson <hp@bitrange.com>
> 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?

Sorry, I dropped the ball on this one.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54217