Change evrp-mode options.

Remove tracing in hybrid mode. Add trace/gori/cache tracing options.
tracing options are now  'trace', 'gori', 'cache', or all combined in 'debug'

	* flag-types.h (enum evrp_mode): Adjust evrp-mode values.
	* gimple-range-cache.cc (DEBUG_RANGE_CACHE): Relocate from.
	* gimple-range-trace.h (DEBUG_RANGE_CACHE): Here.
	* params.opt (--param=evrp-mode): Adjust options.