re PR middle-end/59658 (Document -f* flags enabled by -Og)

re PR middle-end/59658 (Document -f* flags enabled by -Og)

2018-11-14  Sandra Loosemore  <sandra@codesourcery.com>

	PR middle-end/59658

	gcc/
	* doc/invoke.texi (Optimize Options): Clarify that -O0 and -Og
	also suppress many optimizations.  Alphabetize option lists for
	-O1, -O2, and -Os.  Add list of options disabled with -Og, and
	correct documentation for those options to say that.
	* opts.c (default_options_table): Sort table by level and option
	name, to make it easier to correlate to the manual.

From-SVN: r266162