[Patch, AArch64] fix the encoding of MOV immediate instructions in NDEBUG build

[Yufeng Zhang]

Hi,

This patch fixes an inappropriate assertion in AArch64 opcodes which 
causes malfunction of gas in assembling MOV immediate instructions if 
the tools are built with -DNDEBUG.

The patch passes the regression test.

OK to commit?

Thanks,
Yufeng


opcodes/

2012-09-17  Yufeng Zhang  <yufeng.zhang@arm.com>

          * aarch64-asm.c (aarch64_ins_imm_half): Remove 
ATTRIBUTE_UNUSED from
          the parameter 'inst'.
          (aarch64_ins_addr_simm): Add ATTRIBUTE_UNUSED to the parameter 
'inst'.
          (convert_mov_to_movewide): Change to assert (0) when
          aarch64_wide_constant_p returns FALSE.
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