cause of all the mainline Sparc regressions

[Jan Hubicka]

>    From: Jan Hubicka <jh@suse.cz>
>    Date: Thu, 23 May 2002 19:02:35 +0200
> 
>    > I think it makes the most sense to have rest_of_compilation set
>    > a global variable that has CLEANUP_PRE_SIBCALL, CLEANUP_PRE_LOOP,
>    > CLEANUP_POST_REGSTACK, and whatever new one Dave needs.  Then
>    > cleanup_cfg or's that into the mode that it is given.
>    
>    Hmm, I original had global variable to control these, perhaps re-adding
>    it makes sense.
> 
> It looks like we're still figuring out the best way to implement this,
> I'll hold off until this is resolved.
> 
> I personally think just calling delete_unreachable_blocks directly
> from the EH code instead of doing cleanup_cfg invocations is fine.
> But Richard may feel otherwise.

In this particular case, I would really preffer just use
delte_unreachable_blocks, since that is what we want, we don't need full
cleanup that is more expensive and anyway needs to be done properly
later again.

We still may want to change the flags PRE_SIBCALL/PRE_LOOP to be
controlled by the variable, but I think it is independent change.

Honza