[PATCH] Cleanup, use add_to_hard_reg_set instead of SET_HARD_REG_BIT loops.

[Nathan Froyd]

This looks like a nice cleanup.  One comment:

On Wed, Apr 06, 2011 at 10:21:12PM +0400, Anatoly Sokolov wrote:
> @@ -4958,60 +4958,54 @@
>  mark_reload_reg_in_use (unsigned int regno, int opnum, enum reload_type type,
>                         enum machine_mode mode)
>  {
> -  unsigned int nregs = hard_regno_nregs[regno][mode];
> -  unsigned int i;
> -
> -  for (i = regno; i < nregs + regno; i++)
> +  switch (type)
>      {
> -      switch (type)
> -       {
> -       case RELOAD_OTHER:
> -         SET_HARD_REG_BIT (reload_reg_used, i);
> -         break;
> +    case RELOAD_OTHER:
> +      add_to_hard_reg_set (&reload_reg_used, mode, regno);
> +      break;

I wonder if it'd be worth breaking out a reg_set_for_reload_type (int
opnum) function and using it here.  I think it could be profitably used
in clear_reload_reg_in_use, either in this patch in in a followup.

-Nathan