[RFC] SPARC predicates

[Eric Botcazou]

> Really nice stuff Eric.  I always hated all of those constant formation
> hacks I put in there so long ago.  I approve this change.

Thanks for going over it!

> BTW, I might work on the new atomic operation builtin stuff for
> Sparc just so we don't bump heads.

Really nice.  I put it on my todo list, but I'm not very familiar with this 
stuff so I'm really glad you step in.  I for my part plan to review James' 
builtin folding patch and then implement support for Jakub's va_arg pass.

-- 
Eric Botcazou