2005-12-07  Daniel Berlin  <dberlin@dberlin.org>

	* tree-ssa-pre.c (bitmap_set_and): New function.
	(bitmap_set_and_compl): New function.
	(bitmap_set_empty_p): New function.
	(insert_extra_phis): New function.
	(compute_avail): Use insert_extra_phis.

From-SVN: r108183