tree-ssa-copy.c (cached_last_copy_of): Remove.

tree-ssa-copy.c (cached_last_copy_of): Remove.

2010-08-07  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-copy.c (cached_last_copy_of): Remove.
	(valueize_val): New function.
	(get_last_copy_of): Remove.
	(set_copy_of_val): Simplify.
	(dump_copy_of): Likewise.
	(copy_prop_visit_cond_stmt): Use valueize_val.
	(copy_prop_visit_phi_node): Properly handle unvisited names.
	Drop code managing copy-of chains.
	(init_copy_prop): Adjust.
	(fini_copy_prop): Likewise.
	(execute_copy_prop): Remove obsolete comment.

From-SVN: r163032