[PATCH][GAS] aarch64: Add CSR PDEC instruction

[Przemyslaw Wirkus]

> > gas/ChangeLog:
> > 2020-10-27  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
> >
> > 	* NEWS: Update docs.
> > 	* config/tc-aarch64.c (parse_csr_operand): New operand parser.
> > 	(parse_operands): Call to CSR operand parser.
> > 	* testsuite/gas/aarch64/csre_csr-invalid.d: New test.
> > 	* testsuite/gas/aarch64/csre_csr-invalid.l: New test.
> > 	* testsuite/gas/aarch64/csre_csr-invalid.s: New test.
> > 	* testsuite/gas/aarch64/csre_csr.d: New test.
> > 	* testsuite/gas/aarch64/csre_csr.s: New test.
> >
> > include/ChangeLog:
> > 2020-10-27  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
> >
> > 	* opcode/aarch64.h (AARCH64_FEATURE_CSRE): New -march feature.
> > 	(enum aarch64_opnd): New CSR instruction field
> AARCH64_OPND_CSRE_CSR.
> >
> > opcodes/ChangeLog:
> > 2020-10-27  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
> >
> > 	* aarch64-opc.c (aarch64_print_operand): CSR PDEC operand print-
> out.
> > 	* aarch64-tbl.h (CSRE): New CSRE feature handler.
> > 	(_CSRE_INSN): New CSRE instruction type.
> > 	(struct aarch64_opcode): New 'csre' entry for a CSRE CLI feature.
> > 	* aarch64-asm-2.c: Regenerate.
> > 	* aarch64-dis-2.c: Regenerate.
> > 	* aarch64-opc-2.c: Regenerate.
> 
> Approved - please apply.

commit dd4a72c859a6896d6df824535590ccbb3631fdd7

> Cheers
>   Nick