* doc/invoke.texi (Wsuggest-attribute): Document.
	(Wmissing-noreturn): Remove.
	* ipa-pure-const.c (warn_function_noreturn): New function.
	* opts.c (decode_options): Set warn_suggest_attribute_noreturn on
	warn_missing_noreturn.
	* common.opt (Wsuggest-attribute=noreturn): New.
	* tree-flow.h (warn_function_noreturn): Declare.
	* tree-cfg.c (execute_warn_function_noreturn): Use
	warn_function_noreturn.
	(gate_warn_function_noreturn): New.
	(pass_warn_function_noreturn): Update.

From-SVN: r160606