decl.c (define_case_label): Don't crash if we're not in a switch.

decl.c (define_case_label): Don't crash if we're not in a switch.

	* decl.c (define_case_label): Don't crash if we're not in a switch.

	* decl2.c (lang_decode_option): Don't bother explicitly ignoring flags.
	* lang-options.h: Restore -fthis-is-variable.  Remove help strings
	for unsupported flags.
	* decl2.c (lang_decode_option): Accept and ignore -finit-priority.
	Accept and warn about -fthis-is-variable.

From-SVN: r29594