Hi all,

The Linux kernel has done basic enablement and detection of FEAT_CSSC so we can
use the cpuinfo string that they've specified.

This patchlet does that.

Bootstrapped and tested on aarch64-none-linux-gnu.
Pushing to trunk.
Thanks,
Kyrill

gcc/ChangeLog:

	* config/aarch64/aarch64-option-extensions.def (cssc): Specify
	FEATURE_STRING field.