invoke.texi (Option Summary): Add -mverbose-cost-dump to AArch64 and ARM lists, plus...

invoke.texi (Option Summary): Add -mverbose-cost-dump to AArch64 and ARM lists, plus missing -mflip-thumb for ARM.

2017-12-17  Sandra Loosemore  <sandra@codesourcery.com>
	    Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

	gcc/
	* doc/invoke.texi (Option Summary): Add -mverbose-cost-dump
	to AArch64 and ARM lists, plus missing -mflip-thumb for ARM.
	(AArch64 Options): Document -mverbose-cost-dump.
	(ARM Options): Likewise, plus -mflip-thumb.

Co-Authored-By: Kyrylo Tkachov <kyrylo.tkachov@arm.com>
From-SVN: r255773