assign_parm_setup_block handling of parallels

[Eric Botcazou]

> We're changing the port to emit:
> 	(parallel:DF (expr_list (reg:DI 3)))
>
> instead of:
>
> 	(parallel:DF (expr_list (reg:SI 3) (reg:SI 4)))
>
> because of the plethory of subregs and bad code GCC generates.

OK, but what do you expect to achieve by running the multi-member parallel 
optimization on an one-member parallel?

-- 
Eric Botcazou