2010-12-09  Richard Guenther  <rguenther@suse.de>

	* reginfo.c (struct subregs_of_mode_node): Remove.
	(subregs_of_mode): Likewise.
	(som_hash): Likewise.
	(som_eq): Likewise.
	(invalid_mode_changes): New bitmap.
	(record_subregs_of_mode): Get subregs_of_mode argument.
	Fill in invalid_mode_changes bitmap.
	(find_subregs_of_mode): Get subregs_of_mode argument and pass
	it through.
	(init_subregs_of_mode): Adjust.
	(finish_subregs_of_mode): Likewise.
	(invalid_mode_change_p): Query invalid_mode_changes bitmap.

From-SVN: r167632