* system.h (TARGET_OPTIONS, TARGET_SWITCHES): Poison.
	* opts.h (print_filtered_help): Delete.
	* opts.c (handle_option, decode_options): Remove calls to
	set_target_switch.
	(print_target_help): New function.
	(common_option, print_help): Call print_target_help instead of
	display_target_options.
	(print_filtered_help): Make static.
	* toplev.h (display_target_options, set_target_switch): Delete.
	* toplev.c (target_switches, target_options, display_target_options)
	(set_target_switch): Delete.
	(print_switch_values): Remove handling of TARGET_SWITCHES and
	TARGET_OPTIONS.
	(default_get_pch_validity): Likewise.  Only treat target_flags
	specially if targetm.check_pch_target_flags is nonnull.
	(pch_option_mismatch): New function.
	(default_pch_valid_p): Use it.  Remove handling of TARGET_SWITCHES
	and TARGET_OPTIONS.  Only treat target_flags specially if
	targetm.check_pch_target_flags is nonnull.
	* config/ia64/ia64.c (ia64_override_options): Don't mention
	TARGET_OPTIONS in comment.
	* config/m68k/m68k-none.h (CC1_SPEC): Likewise.
	* doc/invoke.texi: Remove a reference to TARGET_SWITCHES.
	* doc/tm.texi (TARGET_DEFAULT_TARGET_FLAGS): Don't mention the
	interaction with TARGET_SWITCHES.
	(TARGET_@var{featurename}, TARGET_SWITCHES, TARGET_OPTIONS): Delete.

From-SVN: r100432