PR middle-end/18667
	* params.c (set_param_value): Add range check.
	* params.def: Add min and max values. Reformat long strings.
	* params.h (struct param_info): Add min and max fields.
	(enum compiler_param): Adjust DEFPARAM.
	* toplev.c (lang_independent_params): Likewise.

From-SVN: r91567