[GAS][AArch64] Add support for Cortex-A78 and Cortex-A78AE

[Przemyslaw Wirkus]

> > Approved and applied.
> 
> Would it be possible for Przemyslaw to apply for write-after-approval commit
> access to Binutils to push his own patches in the future?
> Przemyslaw, I believe you already have an account on sourceware.org for
> GCC?

Yes, I already have an account on sourceware.org for GCC.
The login name is "wirkus".

> Thanks,
> Kyrill
> 
> >
> > Cheers
> >   Nick

kind regards, 
Przemyslaw