* config/arm/arm.opt (print_tune_info): New option.
	* config/arm/arm.c (arm_print_tune_info): New function.
	(arm_file_start): Call arm_print_tune_info.
	* config/arm/arm-protos.h (struct tune_params): Add comment.
	* doc/invoke.texi (@item -mprint-tune-info): New item.
	(-mtune): mention it in ARM Option Summary.

From-SVN: r221650