IF conversion bug with CC0

[Eric Botcazou]

>  From a 30 second view of your ISA, it appears that most
> arithmetic/logicals unconditionally set the condition codes.
> 
> I would suggest modeling condition code handling similar to how it's
> done on the x86 port.

No advertisement intended, but the Visium architecture is the typical 32-bit 
RISC where every single arithmetic/logical unconditionally sets the condition 
code.  Moreover, the port was very recently converted from CC0 to CCmode (with 
uniform post-reload splitters and define_substs tailored for the postreload 
compare elimination pass), so it could be a good model.

-- 
Eric Botcazou