flow.c (calculate_loop_depth): Make global, remove prototype, rewrite to use new loop infrastructure.

	* flow.c (calculate_loop_depth): Make global, remove prototype,
	rewrite to use new loop infrastructure.
	(find_basic_block): Remove calculate_loop_depth call.
	* toplev.c (rest_of_compilation): Call find_basic_block.
	* output.h (calculate_loop_depth): Declare.

From-SVN: r30955