mark_set_1 fix

[Jan Hubicka]

> On Thu, Apr 27, 2000 at 05:58:26PM +0100, graham wrote:
> > I added a similar patch to my local tree to get the
> > bootstrap passed this abort. The only difference was
> > my patch checked for (!= REG) rather than (== MEM) 
> > because the following code only works for a REG.
> 
> A fine distinction, but if we ever find anything but REG or MEM
> in there something's gone very wrong.
Yes, thats was why I've done it only for MEMs (I was interested
what else triggers.)

Also I apologize for the accidental checkin.

Honza
> 
> 
> r~