opcodes/

	* aarch64-opc.c (aarch64_prfops): Change unnamed operation 'name'
	fields to NULL.
	(aarch64_print_operand): Adjust the printing for AARCH64_OPND_PRFOP.

gas/

	* config/tc-aarch64.c (md_begin): Change to check if 'name' is
	NULL.

gas/testsuite/

	* gas/aarch64/system.s: Add tests.
	* gas/aarch64/system.d: Update.
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