2009-06-30  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-alias.c (walk_aliased_vdefs_1): Change interface to
	use ao_ref references.
	(walk_aliased_vdefs): Likewise.
	* tree-ssa-alias.h (walk_aliased_vdefs): Adjust prototype.
	* tree-ssa-dce.c (struct ref_data): Remove.
	(mark_aliased_reaching_defs_necessary_1): Use the ao_ref argument.
	(mark_aliased_reaching_defs_necessary): Adjust.
	(mark_all_reaching_defs_necessary_1): Likewise.

From-SVN: r149086