[PATCH v0 12/13] aarch64: add PAuth_LR instructions with imm16 operand

[Matthieu Longo]

This patch adds the instructions required by Armv9.5-A PAC
enhancements.
- the imm16 variant of auti<k>sppc
- the imm16 variant of reta<k>sppc

It also adds:
- a new operand parser (ADDR_UPCREL16) for 16-bits unsigned
  immediate operand,
- a new relocation type (BFD_RELOC_AARCH64_AUTI_LO16_PCREL)
  specific to the auti<k>sppc and reta<k>sppc instructions
  and only used for computing the PC-relative offset, but
  does no relocation.
- the relevant tests for the instructions.
---
 bfd/elfnn-aarch64.c                      |  8 ++--
 bfd/reloc.c                              | 17 ++++++++-
 gas/config/tc-aarch64.c                  | 47 ++++++++++++++++++++++++
 gas/testsuite/gas/aarch64/pauth_lr-bad.l | 10 ++++-
 gas/testsuite/gas/aarch64/pauth_lr-bad.s | 15 ++++++++
 gas/testsuite/gas/aarch64/pauth_lr.d     | 15 +++++++-
 gas/testsuite/gas/aarch64/pauth_lr.s     | 17 +++++++++
 include/opcode/aarch64.h                 |  1 +
 opcodes/aarch64-opc.c                    | 28 +++++++++-----
 opcodes/aarch64-tbl.h                    | 12 ++++++
 10 files changed, 154 insertions(+), 16 deletions(-)

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