gcc/
	* config/aarch64/aarch64-arches.def: New entry for "armv8.3-a".
	* config/aarch64/aarch64.h (AARCH64_FL_V8_3, AARCH64_FL_FOR_ARCH8_3,
	AARCH64_ISA_V8_3, TARGET_ARMV8_3): New.
	* doc/invoke.texi (AArch64 Options): Document "armv8.3-a".

From-SVN: r244663