Split --param=evrp-mode into evrp-mode and ranger-debug.

Split --param=evrp-mode into evrp-mode and ranger-debug.

With Ranger being used in more than EVRP, the debug output should no longer
be tied up with the EVRP mode flag.

	* doc/invoke.texi (ranger-debug): Document.
	* flag-types.h (enum ranger_debug): New.
	(enum evrp_mode): Remove debug values.
	* gimple-range-cache.cc (DEBUG_RANGE_CACHE): Use new debug flag.
	* gimple-range-gori.cc (gori_compute::gori_compute): Ditto.
	* gimple-range.cc (gimple_ranger::gimple_ranger): Ditto.
	* gimple-ssa-evrp.c (hybrid_folder::choose_value): Ditto.
	(execute_early_vrp): Use evrp-mode directly.
	* params.opt (enum evrp_mode): Remove debug values.
	(ranger-debug): New.
	(ranger-logical-depth): Relocate to be in alphabetical order.