aarch64: Improve naming conventions for A and R-profile architecture

aarch64: Improve naming conventions for A and R-profile architecture

Historically, flags and variables relating to architectural revisions
for the A-profile architecture omitted the trailing `A' such that, for
example, assembling for `-march=armv8.4-a' set the `AARCH64_ARCH_V8_4'
flag in the assembler.

This leads to some ambiguity, since Binutils also targets the
R-profile Arm architecture.  Therefore, it seems prudent to have
everything associated with the A-profile cores end in `A' and likewise
`R' for the R-profile.  Referring back to the example above, the flag
set for `-march=armv8.4-a' is better characterized if labeled
`AARCH64_ARCH_V8_4A'.

The only exception to the rule of appending `A' to variables is found
in the handling of the `AARCH64_FEATURE_V8' macro, as it is the
baseline from which ALL processors derive and should therefore be left
unchanged.

In reflecting the `ARM' architectural nomenclature choices, where we
have `ARM_ARCH_V8A' and `ARM_ARCH_V8R', the choice is made to not have
an underscore separating the numerical revision number and the
A/R-profile indicator suffix.  This has meant that renaming of
R-profile related flags and variables was warranted, thus going from
`.*_[vV]8_[rR]' to `.*_[vV]8[rR]'.

Finally, this is more in line with conventions within GCC and adds consistency
across the toolchain.

gas/ChangeLog:
	* gas/config/tc-aarch64.c:
	(aarch64_cpus): Reference to arch feature macros updated.
	(aarch64_archs): Likewise.

include/ChangeLog:
	* include/opcode/aarch64.h:
	(AARCH64_FEATURE_V8A): Updated name: V8_A -> V8A.
	(AARCH64_FEATURE_V8_1A): A-suffix added.
	(AARCH64_FEATURE_V8_2A): Likewise.
	(AARCH64_FEATURE_V8_3A): Likewise.
	(AARCH64_FEATURE_V8_4A): Likewise.
	(AARCH64_FEATURE_V8_5A): Likewise.
	(AARCH64_FEATURE_V8_6A): Likewise.
	(AARCH64_FEATURE_V8_7A): Likewise.
	(AARCH64_FEATURE_V8_8A):Likewise.
	(AARCH64_FEATURE_V9A): Likewise.
	(AARCH64_FEATURE_V8R): Updated name: V8_R -> V8R.
	(AARCH64_ARCH_V8A_FEATURES): Updated name: V8_A -> V8A.
	(AARCH64_ARCH_V8_1A_FEATURES): A-suffix added.
	(AARCH64_ARCH_V8_2A_FEATURES): Likewise.
	(AARCH64_ARCH_V8_3A_FEATURES): Likewise.
	(AARCH64_ARCH_V8_4A_FEATURES): Likewise.
	(AARCH64_ARCH_V8_5A_FEATURES): Likewise.
	(AARCH64_ARCH_V8_6A_FEATURES): Likewise.
	(AARCH64_ARCH_V8_7A_FEATURES): Likewise.
	(AARCH64_ARCH_V8_8A_FEATURES): Likewise.
	(AARCH64_ARCH_V9A_FEATURES): Likewise.
	(AARCH64_ARCH_V9_1A_FEATURES): Likewise.
	(AARCH64_ARCH_V9_2A_FEATURES): Likewise.
	(AARCH64_ARCH_V9_3A_FEATURES): Likewise.
	(AARCH64_ARCH_V8A): Updated name: V8_A -> V8A.
	(AARCH64_ARCH_V8_1A): A-suffix added.
	(AARCH64_ARCH_V8_2A): Likewise.
	(AARCH64_ARCH_V8_3A): Likewise.
	(AARCH64_ARCH_V8_4A): Likewise.
	(AARCH64_ARCH_V8_5A): Likewise.
	(AARCH64_ARCH_V8_6A): Likewise.
	(AARCH64_ARCH_V8_7A): Likewise.
	(AARCH64_ARCH_V8_8A): Likewise.
	(AARCH64_ARCH_V9A): Likewise.
	(AARCH64_ARCH_V9_1A): Likewise.
	(AARCH64_ARCH_V9_2A): Likewise.
	(AARCH64_ARCH_V9_3A): Likewise.
	(AARCH64_ARCH_V8_R): Updated name: V8_R -> V8R.

opcodes/ChangeLog:
	* opcodes/aarch64-opc.c (SR_V8A): Updated name: V8_A -> V8A.
	(SR_V8_1A): A-suffix added.
	(SR_V8_2A): Likewise.
	(SR_V8_3A): Likewise.
	(SR_V8_4A): Likewise.
	(SR_V8_6A): Likewise.
	(SR_V8_7A): Likewise.
	(SR_V8_8A): Likewise.
	(aarch64_sys_regs): Reference to arch feature macros updated.
	(aarch64_pstatefields): Reference to arch feature macros updated.
	(aarch64_sys_ins_reg_supported_p): Reference to arch feature macros
	updated.
	* opcodes/aarch64-tbl.h:
	(aarch64_feature_v8_2a): a-suffix added.
	(aarch64_feature_v8_3a): Likewise.
	(aarch64_feature_fp_v8_3a): Likewise.
	(aarch64_feature_v8_4a): Likewise.
	(aarch64_feature_fp_16_v8_2a): Likewise.
	(aarch64_feature_v8_5a): Likewise.
	(aarch64_feature_v8_6a): Likewise.
	(aarch64_feature_v8_7a): Likewise.
	(aarch64_feature_v8r): Updated name: v8_r-> v8r.
	(ARMV8R): Updated name: V8_R-> V8R.
	(ARMV8_2A): A-suffix added.
	(ARMV8_3A): Likewise.
	(FP_V8_3A): Likewise.
	(ARMV8_4A): Likewise.
	(FP_F16_V8_2A): Likewise.
	(ARMV8_5): Likewise.
	(ARMV8_6A): Likewise.
	(ARMV8_6A_SVE): Likewise.
	(ARMV8_7A): Likewise.
	(V8_2A_INSN): `A' added to macro symbol.
	(V8_3A_INSN): Likewise.
	(V8_4A_INSN): Likewise.
	(FP16_V8_2A_INSN): Likewise.
	(V8_5A_INSN): Likewise.
	(V8_6A_INSN): Likewise.
	(V8_7A_INSN): Likewise.
	(V8R_INSN): Updated name: V8_R-> V8R.