[PATCH 1/2][Aarch64][binutils] Add support for PAN architecture extension.

[Nicholas Clifton]

Hi Matthew,

> include/opcode
> 2015-05-20  Matthew Wahab  <matthew.wahab@arm.com>
>
>      * aarch64.h (AARCH64_FEATURE_PAN): New.
>      (aarch64_sys_reg_supported_p): Declare.
>      (aarch64_pstatefield_supported_p): Declare.
>
> opcodes/
> 2015-05-20  Matthew Wahab  <matthew.wahab@arm.com>
>      * aarch64-opc.c (F_ARCHEXT): New.
>      (aarch64_sys_regs): Add "pan".
>      (aarch64_sys_reg_supported_p): New.
>      (aarch64_pstatefields): Add "pan".
>      (aarch64_pstatefield_supported_p): New.

Approved - please apply.

Cheers
   Nick