2007-11-09  Richard Guenther  <rguenther@suse.de>

	* bitmap.h (bitmap_single_bit_set_p): Declare.
	* bitmap.c (bitmap_single_bit_set_p): New function.
	* tree-ssa-alias.c (add_may_alias_for_new_tag): Use it.
	(maybe_create_global_var): Use bitmap_empty_p.

From-SVN: r130045