Come up with Deprecated option flag.

Come up with Deprecated option flag.

2018-06-12  Martin Liska  <mliska@suse.cz>

	* doc/options.texi: Document Deprecated option flag.
2018-06-12  Martin Liska  <mliska@suse.cz>

	* config/i386/i386.opt: Make MPX-related options as Deprecated.
	* opt-functions.awk: Handle Deprecated flag.
	* opts-common.c (decode_cmdline_option): Handle cl_deprecated
        and report error.
	(read_cmdline_option): Report warning for a deprecated option.
	* opts.h (struct cl_option): Add new field cl_deprecated.
	(CL_ERR_DEPRECATED): New.
2018-06-12  Martin Liska  <mliska@suse.cz>

	* c.opt: Make MPX-related options as Deprecated.
2018-06-12  Martin Liska  <mliska@suse.cz>

	* g++.dg/opt/mpx.C: New test.
	* gcc.target/i386/mpx.c: New test.

From-SVN: r261497