[rtlopt] bb-reorder fix

[Jan Hubicka]

> > I have fixed the problem in bb_to_key () and have fixed some problems in
> > connect_traces () but I'm not sure I have fixed the problem with
> > accessing index -1 of array.
> > 
> > I'm bootstrapping it right now.
> 
> It bootstrapped i386.
> It also passed valgrind tests which discovered the bugs.
> So I'm going to commit it to rtlopt branch.
> 
> OK for hammer branch?
OK, Thanks!

Honza
> 
> Josef
> 
> > Sun Dec 15 21:35:47 CET 2002  Josef Zlomek <zlomj9am@artax.karlin.mff.cuni.cz>
> > 
> > 	* bb-reorder.c (bb_to_key): Fix accessing index -1 of array.
> > 	(connect_traces): Fix several bugs.