* io/io.h (st_parameter_dt): Revert 2005-12-10 change to

	u.pad, fix comment.
	(check_st_parameter_dt): New compile time assert.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@112850 138bc75d-0d04-0410-961f-82ee72b054a4