Sort options of gcov, gcov-dump and gcov-tool both in --help and documentation

Sort options of gcov, gcov-dump and gcov-tool both in --help and documentation

2017-04-28  Martin Liska  <mliska@suse.cz>

	* doc/gcov.texi: Sort options in alphabetic order.
	* doc/gcov-dump.texi: Likewise.
	* doc/gcov-tool.texi: Likewise.
	* gcov.c (print_usage): Likewise.
	* gcov-dump.c (print_usage): Likewise.
	* gcov-tool.c (print_merge_usage_message): Likewise.
	(print_rewrite_usage_message): Likewise.
	(print_overlap_usage_message): Likewise.

From-SVN: r247376