bb-reorder rewrite

[Jason Eckhardt]

On Wed, 24 May 2000, Richard Henderson wrote:

> On Wed, May 24, 2000 at 04:52:33PM -0700, Jason Eckhardt wrote:
> 
> >   It appears that e_fall gets disconnected properly, but its pred_next
> >   field is never updated. Perhaps it should be zeroed?
> 
> Yep.
> 

  FYI, I just tried another i686-linux bootstrap with
  enable-checking after zeroing the field and fortunately it gets rid of
  the failure I reported earlier (the bootstrap is clean).