* c-decl.c (store_parm_decls): Make saved_warn_shadow boolean.

	* c-decl.c (store_parm_decls): Make saved_warn_shadow boolean.
	* common.opt: Add remaining -W options and -g.
	* diagnostic.c (warnings_are_errors): Remove.
	* flags.h: Make most warning flags boolean.
	* opts.c (common_handle_option): Handle remaining -W options, and -g.
	Move many warning flags from toplev.c, making them boolean.
	* toplev.c: Remove many warning flags.
	(decode_W_option): Remove.
	(decode_g_option): Make extern.  Error on unknown switch.
	(lang_independent_W_options): Use warn_dummy.
	(independent_decode_option): Just handle -f switches now.
	* toplev.h (decode_g_option): New.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@68287 138bc75d-0d04-0410-961f-82ee72b054a4