* common.opt (frename-registers): Initialize to 2.
	(fweb): Ditto.
	(fgcse-after-reload): Ditto.
	* toplev.c (AUTODETECT_FLAG_VAR_TRACKING): Rename to AUTODETECT_VALUE.
	(process_options): Only change flag_web, flag_rename_registers,
	and flag_rerun_cse_after_loop if not explicitly set by user.

From-SVN: r102141