[PATCH][AArch64] Add ARMv8.3 command line option and feature flag

[Szabolcs Nagy]

ARMv8.3 can be selected with -march=armv8.3-a command line option.
An overview of the ARMv8.3 architecture extension is at
https://community.arm.com/groups/processors/blog/2016/10/27/armv8-a-architecture-2016-additions

gas/
2016-11-07  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* config/tc-aarch64.c (aarch64_archs): Add "armv8.3-a".
	* doc/c-aarch64.texi (-march): Likewise.

include/opcode/
2016-11-07  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* aarch64.h (AARCH64_FEATURE_V8_3): New.
	(AARCH64_ARCH_V8_3): New.
	(AARCH64_ARCH_V8_1, AARCH64_ARCH_V8_2): Simplify.

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