[PATCH][GAS][AArch64] Add new command-line options and macros for Armv8.4-a [Patch (2/6)]

[Tamar Christina]

Hi All,

This patch adds assembler and disassembler support for the new Armv8.4-a
command-line options and supporting feature macros for AArch64.
    
The support can be enabled through various new extensions which have all
been back-ported back to Armv8.2-a.

The new extensions are:

	+sm4 - Includes support for the encryption algorithms in the
               SM3 and SM4 class.

	+sha3 - New SHA3 and SHA2 instructions added to Armv8.4-a and
	        back-ported to Armv8.2-a, implies SHA2

along with a new architecture "armv8.4-a".

These extensions can be used with Armv8.2-a and higher.

Checked with check-gas on aarch64-none-elf and aarch64_be-none-elf,
no regressions.

Ok for master?

Ps. I do not have commit access so if OK can someone apply for me?

Thanks,
Tamar


gas/
2017-11-08  Tamar Christina  <tamar.christina@arm.com>

	* config/tc-aarch64.c (aarch64_arch_option_table): Add armv8.4-a.
	(aarch64_features):	Added SM4 and SHA3.

include/
2017-11-08  Tamar Christina  <tamar.christina@arm.com>

	* opcode/aarch64.h: 
	(AARCH64_FEATURE_V8_4, AARCH64_FEATURE_SM4): New.
	(AARCH64_ARCH_V8_4, AARCH64_FEATURE_SHA3): New.

opcodes/
2017-11-08 Tamar Christina  <tamar.christina@arm.com>

	* aarch64-tbl.h
	(aarch64_feature_v8_4, aarch64_feature_crypto_v8_2): New.
	(aarch64_feature_sm4, aarch64_feature_sha3): New.
	(aarch64_feature_fp_16_v8_2): New.
	(ARMV8_4, SHA3, SM4, CRYPTO_V8_2, FP_F16_V8_2): New.
	(V8_4_INSN, CRYPTO_V8_2_INSN): New.
	(SHA3_INSN, SM4_INSN, FP16_V8_2_INSN): New.

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