* sim-profile.h: Make like sim-trace.h.

	* sim-profile.h: Make like sim-trace.h.
	(PROFILE_USEFUL_MASK): New macro.
	* sim-profile.c (profile_options): Make like trace_options, allow
	optional on|off arg where applicable.
	(set_profile_option_mask): New function.
	(sim_profile_set_option): New function.
	(profile_option_handler): Simplify.
	Have -p only enable selected things, not everything.
	Add missing break to OPTION_PROFILE_PC_RANGE.
	* cgen-scache.c (scache_options): Allow optional on|off arg to
	--profile-scache.
	(scache_option_handler): Use sim_profile_set_option.