[Patch, AArch64] Add support for alias instructions SXTL, SXTL2, UXTL and UXTL2

[nick clifton]

Hi Yufeng,

> include/opcode/
> 2013-01-30  Yufeng Zhang  <yufeng.zhang@arm.com>
>
>      * aarch64.h (aarch64_op): Add OP_SXTL, OP_SXTL2, OP_UXTL and OP_UXTL2.
>
> opcodes/
> 2013-01-30  Yufeng Zhang  <yufeng.zhang@arm.com>
>
>      * aarch64-tbl.h (aarch64_opcode_table): Flag sshll, sshll2, ushll and
>      ushll2 with F_HAS_ALIAS.  Add entries for sxtl, sxtl2, uxtl and uxtl2.
>      * aarch64-asm.c (convert_xtl_to_shll): New function.
>      (convert_to_real): Handle OP_SXTL, OP_SXTL2, OP_UXTL and OP_UXTL2 by
>      calling convert_xtl_to_shll.
>      * aarch64-dis.c (convert_shll_to_xtl): New function.
>      (convert_to_alias): Handle OP_SXTL, OP_SXTL2, OP_UXTL and OP_UXTL2 by
>      calling convert_shll_to_xtl.
>      * aarch64-asm-2.c: Re-generate.
>      * aarch64-dis-2.c: Re-generate.
>      * aarch64-opc-2.c: Re-generate.
>
> gas/testsuite/
> 2013-01-30  Yufeng Zhang  <yufeng.zhang@arm.com>
>
>      * gas/aarch64/alias.s: Add new tests.
>      * gas/aarch64/alias.d: Update.
>      * gas/aarch64/no-aliases.d: Update.

Approved for mainline - please apply.

Cheers
   Nick