[PATCH] arm, objdump: Support pac_key_* register operand for MRS/MSR in Armv8.1-M Mainline

[Andre Vieira]

Add support for pac_key_[pu]_[0-3](_ns)? register operands for the MRS and MSR
instructions when assembling for Armv8.1-M Mainline, as well as adding the
corresponding support for disassembling instructions that use it.

Tested on arm-none-eabi, arm-wince and arm-vxworks.

OK for trunk?
---
 gas/config/tc-arm.c                       |  18 ++-
 gas/testsuite/gas/arm/archv8_1m-pac-msr.d | 137 ++++++++++++++++++++++
 gas/testsuite/gas/arm/archv8_1m-pac-msr.s |  77 ++++++++++++
 opcodes/arm-dis.c                         |  29 ++++-
 4 files changed, 257 insertions(+), 4 deletions(-)
 create mode 100644 gas/testsuite/gas/arm/archv8_1m-pac-msr.d
 create mode 100644 gas/testsuite/gas/arm/archv8_1m-pac-msr.s

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