Import from mainline to fix PR gold/21868.

Import from mainline to fix PR gold/21868.

2017-08-28  James Clarke <jrtc27@jrtc27.com>

gold/ChangeLog:
	PR gold/21868
	* aarch64.cc (AArch64_relobj::try_fix_erratum_843419_optimized):
	Add extra view offset argument to function.
	(AArch64_relobj::fix_errata_and_relocate_erratum_stubs): Add
	extra view offset set to the output offset when the view has
	is_input_output_view set, since it has not already been
	included. Pass this to try_fix_erratum_843419_optimized.