[Patch, AArch64] Fix the support for PRFM instructions with preload instruction hints

[Yufeng Zhang]

Hi,

This patch fixes an issue that GAS incorrectly rejects preload 
instruction hints in the PRFM instructions.  These preload instruction 
hints are:

      PLIL1KEEP
      PLIL1STRM
      PLIL2KEEP
      PLIL2STRM
      PLIL3KEEP
      PLIL3STRM

Is it OK for the trunk and the 2_23-branch branch?

Thanks,
Yufeng


opcodes/

2013-02-14  Yufeng Zhang  <yufeng.zhang@arm.com>

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

gas/

2013-02-14  Yufeng Zhang  <yufeng.zhang@arm.com>

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

gas/testsuite/

2013-02-14  Yufeng Zhang  <yufeng.zhang@arm.com>

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