[patch, ARM] Fix PR42017, LR not used in leaf functions

[Eric Botcazou]

> > It seems a lot of other ports suffer from the same problem though.
> > I wonder which targets really do want to make a register live throughout
> > the function?  If none do, perhaps we should say that this macro is
> > only meaningful once the epilogue has been generated.
>
> To answer my own question, I suppose VRSAVE is one.  So I was wrong
> about the target-independent "fix".

We have %i7 on the SPARC (register where the return address register is saved).

-- 
Eric Botcazou