alternate jump.c patch

[Jan Hubicka]

> Tue Jul 17 22:32:46 CEST 2001  Jan Hubicka  <jh@suse.cz>
> 	* flow.c (merge_blocks): Conditionalize the tail_recursion_label
> 	test by CLEANUP_PRE_SIBCALL.
> 	(try_optimize_cfg): Make removal of unneeded labels first;
> 	avoid removal of tail_recursion_labels in PRE_SIBCALL mode;
> 	remove fallthru block only if it has no label.
Just note that the patch has 3 staged and regtested i586.

I need to go sleep now, as it was a long day today.  Bye.
Honza