Arm A-profile feature names

自 2020 年 6 月开始，Arm A-profile 架构的 feature name 全部更改为标准的格式，都以 FEAT_ 前缀打头。从 feature name 上已经无法分辨是那个 archtecture 版本引入的功能了。

Old name	New name	Short description	Comments
ARMv8.0-AdvSIMD	FEAT_AdvSIMD	Advanced SIMD Extension
ARMv8.0-AES	FEAT_AES	Advanced SIMD AES instructions
ARMv8.0-AES	FEAT_PMULL	Advanced SIMD PMULL instructions	ARMv8.0-AES is split into AES and PMULL
ARMv8.0-CP15SDISABLE2	FEAT_CP15SDISABLE2	CP15DISABLE2
ARMv8.0-CSV2	FEAT_CSV2	Cache Speculation Variant 2
ARMv8.0-CSV3	FEAT_CSV3	Cache Speculation Variant 3
ARMv8.0-DGH	FEAT_DGH	Data Gathering Hint
ARMv8.0-DoubleLock	FEAT_DoubleLock	Double Lock
ARMv8.0-ETS	FEAT_ETS	Enhanced Translation Synchronization
ARMv8.0-FP	FEAT_FP	Floating point extension
ARMv8.0-PCSample	FEAT_PCSRv8	PC Sample-base Profiling extension (not EL3 and EL2)
ARMv8.0-PredInv	FEAT_SPECRES	Speculation restriction instructions
RAS	FEAT_RAS	Reliability, Availability, and Serviceability (RAS) Extension
ARMv8.0-SB	FEAT_SB	Speculation barrier
ARMv8.0-SHA	FEAT_SHA1	Advanced SIMD SHA1 instructions
ARMv8.0-SHA	FEAT_SHA256	Advanced SIMD SHA256 instructions	Split ARMv8.2-SHA into SHA-256, SHA-512 and SHA-3
ARMv8.0-SSBS	FEAT_SSBS	Speculative Store Bypass Safe Instruction	ARMv8.0-SSBS is split into SSBS and SSBS2
ARMv8.0-SSBS	FEAT_SSBS2	MRS and MSR instructions for SSBS	ARMv8.0-SSBS is split into SSBS and SSBS2
	FEAT_CRC32	CRC32 instructions
ARMv8.1-Debug	FEAT_Debugv8p1	Debug with VHE
ARMv8.1-HPD	FEAT_HPDS	Hierarchical permission disables in translation tables
ARMv8.1-LOR	FEAT_LOR	Limited ordering regions
ARMv8.1-LSE	FEAT_LSE	Large System Extensions
ARMv8.1-PAN	FEAT_PAN	Privileged access-never
ARMv8.1-PMU	FEAT_PMUv3p1	PMU extensions version 3.1
ARMv8.1-RDMA	FEAT_RDM	Rounding double multiply accumulate
ARMv8.1-TTHM	FEAT_HAFDBS	Hardware updates to access flag and dirty state in translation tables
ARMv8.1-VHE	FEAT_VHE	Virtualization