[AArch64][binutils] Add support for ARMv8.1 Virtulization Host Extensions

[Nick Clifton]

Hi Matthew,

> include/opcode/
> 2015-11-16  Matthew Wahab  <matthew.wahab@arm.com>
>
>      * aarch64.h (AARCH64_FEATURE_V8_1): New.
>      (AARCH64_ARCH_v8_1): Add AARCH64_FEATURE_V8_1.
>
> opcodes/
> 2015-11-16  Matthew Wahab  <matthew.wahab@arm.com>
>
>      * aarch64-opc.c (aarch64_sys_regs): Add spsr_el12, elr_el12,
>      sctlr_el12, cpacr_el12, ttbr1_el2, ttbr0_el12, ttbr1_el12,
>      tcr_el12, afsr0_el12, afsr1_el12, esr_el12, far_el12, mair_el12,
>      amair_el12, vbar_el12, contextidr_el2, contextidr_el12,
>      cntkctl_el12, cntp_tval_el02, cntp_ctl_el02, cntp_cval_el02,
>      cntv_tval_el02, cntv_ctl_el02, cntv_cval_el02, cnthv_tval_el2,
>      cnthv_ctl_el2, cnthv_cval_el2.
>      (aarch64_sys_reg_supported_p): Update for the new system
>      registers.
>
> gas/testsuite/
> 2015-11-16  Matthew Wahab  <matthew.wahab@arm.com>
>
>      * virthostext-directive.d: New.
>      * virthostext.d: New.
>      * virthostext.s: New.

Approved for the trunk.  You will have to ask Tristan if you want the 
patch to go into the 2.26 branch however.

Cheers
   Nick