rtl-iter.h: New file.

rtl-iter.h: New file.

gcc/
	* rtl-iter.h: New file.
	* rtlanal.c: Include it.
	(rtx_all_subrtx_bounds, rtx_nonconst_subrtx_bounds): New variables.
	(generic_subrtx_iterator <T>::add_single_to_queue)
	(generic_subrtx_iterator <T>::add_subrtxes_to_queue)
	(generic_subrtx_iterator <T>::free_array): New functions.
	(generic_subrtx_iterator <T>::LOCAL_ELEMS): Define.
	(generic_subrtx_iterator <const_rtx_accessor>)
	(generic_subrtx_iterator <rtx_var_accessor>
	(generic_subrtx_iterator <rtx_ptr_accessor>): Instantiate.
	(setup_reg_subrtx_bounds): New function.
	(init_rtlanal): Call it.

From-SVN: r214618