aarch64: Add support for +mops

aarch64: Add support for +mops

This patch adds support for FEAT_MOPS, an Armv8.8-A extension
that provides memcpy and memset acceleration instructions.

I took the perhaps controversial decision to generate the individual
instruction forms using macros rather than list them out individually.
This becomes useful with a follow-on patch to check that code follows
the correct P/M/E sequence.
[https://developer.arm.com/documentation/ddi0596/2021-09/Base-Instructions?lang=en]

include/
	* opcode/aarch64.h (AARCH64_FEATURE_MOPS): New macro.
	(AARCH64_ARCH_V8_8): Make armv8.8-a imply AARCH64_FEATURE_MOPS.
	(AARCH64_OPND_MOPS_ADDR_Rd): New aarch64_opnd.
	(AARCH64_OPND_MOPS_ADDR_Rs): Likewise.
	(AARCH64_OPND_MOPS_WB_Rn): Likewise.

opcodes/
	* aarch64-asm.h (ins_x0_to_x30): New inserter.
	* aarch64-asm.c (aarch64_ins_x0_to_x30): New function.
	* aarch64-dis.h (ext_x0_to_x30): New extractor.
	* aarch64-dis.c (aarch64_ext_x0_to_x30): New function.
	* aarch64-tbl.h (aarch64_feature_mops): New feature set.
	(aarch64_feature_mops_memtag): Likewise.
	(MOPS, MOPS_MEMTAG, MOPS_INSN, MOPS_MEMTAG_INSN)
	(MOPS_CPY_OP1_OP2_PME_INSN, MOPS_CPY_OP1_OP2_INSN, MOPS_CPY_OP1_INSN)
	(MOPS_CPY_INSN, MOPS_SET_OP1_OP2_PME_INSN, MOPS_SET_OP1_OP2_INSN)
	(MOPS_SET_INSN): New macros.
	(aarch64_opcode_table): Add MOPS instructions.
	(aarch64_opcode_table): Add entries for AARCH64_OPND_MOPS_ADDR_Rd,
	AARCH64_OPND_MOPS_ADDR_Rs and AARCH64_OPND_MOPS_WB_Rn.
	* aarch64-opc.c (aarch64_print_operand): Handle
	AARCH64_OPND_MOPS_ADDR_Rd, AARCH64_OPND_MOPS_ADDR_Rs and
	AARCH64_OPND_MOPS_WB_Rn.
	(verify_three_different_regs): New function.
	* aarch64-asm-2.c: Regenerate.
	* aarch64-dis-2.c: Likewise.
	* aarch64-opc-2.c: Likewise.

gas/
	* doc/c-aarch64.texi: Document +mops.
	* config/tc-aarch64.c (parse_x0_to_x30): New function.
	(parse_operands): Handle AARCH64_OPND_MOPS_ADDR_Rd,
	AARCH64_OPND_MOPS_ADDR_Rs and AARCH64_OPND_MOPS_WB_Rn.
	(aarch64_features): Add "mops".
	* testsuite/gas/aarch64/mops.s, testsuite/gas/aarch64/mops.d: New test.
	* testsuite/gas/aarch64/mops_invalid.s,
	* testsuite/gas/aarch64/mops_invalid.d,
	* testsuite/gas/aarch64/mops_invalid.l: Likewise.