Inconsistent next_bb info when EXIT is a successor

[Andrey Belevantsev]

Steven Bosscher wrote:
> No. The condition you're checking is simply not true in cfglayout
> mode. The whole point of cfglayout mode is to get rid of the
> requirement that basic blocks are serial. That means a fallthru edge
> in cfglayout mode doesn't have to go to next_bb. It can go to *any*
> bb.
Yes, but I'm not in cfglayout mode, because I'm either in sched1 or 
sched2.  In that case, should this condition be preserved or not?

Andrey