[PATCH] AArch64: add GAS support for UDF instruction

[Alex Coplan]

Hello,

The attached patch adds support to the AArch64 assembler for the UDF instruction, see
https://developer.arm.com/docs/ddi0596/a/a64-base-instructions-alphabetic-order/udf-permanently-undefined

Note that the files marked regenerated are not included in the patch in order to
keep the size of the patch down: these will need to be regenerated before
commit.

Testing:
 - New regression test added: fails before and passes after the patch.
 - Bootstrap and regression on aarch64-linux.

Ok for master? If so, I will need a maintainer to regenerate the generated files
and commit the patch as I don't have commit access.

Thanks,
Alex

---

binutils/ChangeLog:

2020-04-27  Alex Coplan  <alex.coplan@arm.com>

        * testsuite/binutils-all/aarch64/in-order-all.d: Update to use new
          disassembly.
        * testsuite/binutils-all/aarch64/out-of-order-all.d: Likewise.

ld/ChangeLog:

2020-04-28  Alex Coplan  <alex.coplan@arm.com>

        * testsuite/ld-aarch64/erratum843419_tls_ie.d: Use udf in disassembly.
        * testsuite/ld-aarch64/farcall-b-section.d: Likewise.
        * testsuite/ld-aarch64/farcall-back.d: Likewise.
        * testsuite/ld-aarch64/farcall-bl-section.d: Likewise.

gas/ChangeLog:

2020-04-27  Alex Coplan  <alex.coplan@arm.com>

        * config/tc-aarch64.c (fix_insn): Implement for AARCH64_OPND_UNDEFINED.
        * config/tc-aarch64.c (parse_operands): Likewise.
        * testsuite/gas/aarch64/udf.s: New.
        * testsuite/gas/aarch64/udf.d: New.

include/ChangeLog:

2020-04-27  Alex Coplan  <alex.coplan@arm.com>

        * opcode/aarch64.h (enum aarch64_opnd): Add AARCH64_OPND_UNDEFINED.

opcodes/ChangeLog:

2020-04-27  Alex Coplan  <alex.coplan@arm.com>

        * aarch64-opc.h (enum aarch64_field_kind): Add FLD_imm16_2.
        * aarch64-opc.c (fields): Add entry for FLD_imm16_2.
        * aarch64-tbl.h (aarch64_opcode_table): Add udf instruction, entry for
          FLD_imm16_2.
        * aarch64-asm-2.c: Regenerated.
        * aarch64-dis-2.c: Regenerated.
        * aarch64-opc-2.c: Regenerated.
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