* params.c (params_finished): New.
	(add_params): Assert !params_finished.
	(finish_params): New.
	(set_param_value_internal): Take params and params_set
	parameters.  Assert params_finished.
	(set_param_value, maybe_set_param_value): Take params and
	params_set parameters.  Update calls to set_param_value_internal.
	(set_default_param_value): Assert !params_finished.  Don't use
	set_param_value_internal.
	(default_param_value, init_param_values): New.
	* params.h (struct param_info): Change value to default_value.
	Remove set.
	(set_param_value, maybe_set_param_value): Add params and
	params_set parameters.
	(PARAM_VALUE): Get parameters from global_options.
	(PARAM_SET_P): Remove.
	(finish_params, default_param_value, init_param_values): New.
	* common.opt (param_values): New Variable.
	* config/arm/arm.c (arm_option_override): Pass extra arguments to
	maybe_set_param_value.
	* config/i386/i386.c (ix86_option_override_internal): Pass extra
	arguments to maybe_set_param_value.
	* config/picochip/picochip.c (picochip_option_override): Pass
	extra arguments to maybe_set_param_value.
	* config/rs6000/rs6000.c (rs6000_option_override_internal): Pass
	extra arguments to maybe_set_param_value.
	* config/s390/s390.c (s390_option_override): Use
	maybe_set_param_value instead of set_param_value.  Pass extra
	arguments to maybe_set_param_value.
	* config/sparc/sparc.c (sparc_option_override): Pass extra
	arguments to maybe_set_param_value.
	* config/spu/spu.c (spu_option_override): Pass extra arguments to
	maybe_set_param_value.
	* opts.c (handle_param): Take opts and opts_set parameters.
	Update call to set_param_value.
	(initial_min_crossjump_insns,
	initial_max_fields_for_field_sensitive,
	initial_loop_invariant_max_bbs_in_loop): Remove.
	(init_options_once): Don't set them.
	(init_options_struct): Initialize parameters structures.
	(default_options_optimization): Use default_param_value when
	restoring defaults.  Update calls to maybe_set_param_value.
	(finish_options): Update calls to maybe_set_param_value.
	(common_handle_option): Update calls to handle_param and
	set_param_value.
	* toplev.c (DEFPARAM): Update definition for changes to
	param_info.
	(general_init): Call finish_params.

From-SVN: r165460