invoke.texi (Invoking GCC): Add new section to menu.

invoke.texi (Invoking GCC): Add new section to menu.

2016-01-18  Sandra Loosemore <sandra@codesourcery.com>

	gcc/
	* doc/invoke.texi (Invoking GCC): Add new section to menu.
	(Option Summary): Update to reflect new section and moved options.
	(C++ Dialect Options): Move -fstats to new section.
	(Debugging Options): Move all dump, statistics, and other GCC
	developer options to new section.  Rewrite section introduction
	and re-order remaining options to put the more basic ones first.
	(Optimization Options): Move -fira-verbose and -flto-report* to
	new section.
	(Developer Options): New section incorporating moved options.
	* doc/cppopts.texi (-dM): Update cross-reference.

From-SVN: r232541