[PATCH, AArch64] Deprecate the alias system registers spsr_svc and spsr_hyp

[Yufeng Zhang]

Hi,

This patch updates the AArch64 gas to warn about the deprecated alias 
system registers names "spsr_svc" and "spsr_hyp", as a response to a 
recent clarification in the ISA.  The names "spsr_el1" and "spsr_el2" 
are preferred.

OK for the trunk and 2.24?

Thanks,
Yufeng

gcc/

	* config/tc-aarch64.c (parse_sys_reg): Update to use aarch64_sys_reg;
	call aarch64_sys_reg_deprecated_p and warn about the deprecated
	system registers.

gas/testsuite/

	* gas/aarch64/deprecated.d: New file.
	* gas/aarch64/deprecated.l: New file.
	* gas/aarch64/deprecated.s: New file.
	* gas/aarch64/sysreg-1.s: Add tests.
	* gas/aarch64/sysreg-1.d: Add tests.

include/opcode/

	* aarch64.h (aarch64_sys_reg): New typedef.
	(aarch64_sys_regs): Change to define with the new type.
	(aarch64_sys_reg_deprecated_p): Declare.

opcodes/

	* aarch64-opc.c (F_DEPRECATED): New macro.
	(aarch64_sys_regs): Update; flag "spsr_svc" and "spsr_hyp" with
	F_DEPRECATED.
	(aarch64_print_operand): Call aarch64_sys_reg_deprecated_p on
	AARCH64_OPND_SYSREG.
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