[PATCH] Fix runtime linker auditing on aarch64

[Florian Weimer]

* Ben Woodard via Libc-alpha:

> To fix this
>   * The La_aarch64_regs structure was expanded to include x8 and the full
>     sized NEON V registers that are required to be preserved by the ABI.

Off-list, you said that the audit interface was completely broken on
AArch64.  But it seems to be working enough for sotruss.  So I do wonder
if we have to do a proper ABI transition here after all (bumping
LAV_CURRENT and all the consequences of that).

Thanks,
Florian
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