PR tree-optimization/81945
	* cfgloop.h (FOR_EACH_LOOP_FN): Use FN instead of hardcoding fn.
	* tree-cfg.c (move_sese_region_to_fn): If any of the loops moved
	to dest_cfun has orig_loop_num set, either remap it to the new
	loop number if the loop got moved too, or clear it.

	* gcc.dg/graphite/pr81945.c: New test.

From-SVN: r255438