[AArch64] Additional SVE instructions

[Nick Clifton]

Hi Richard,

> This patch supports some additions to the SVE architecture prior to
> its public release.
> 
> Tested on aarch64-linux-gnu. 

Did you check both big-endian and little-endian ?  (I have checked and
I know that there are no problems, but I just want to make the point that
it helps to know all the variations that you have tested.  Hmm, I probably
should have checked ilp32 as well...)

> OK for trunk and 2.28?

Approved for mainline.

Please check with Tristan for the 2.28 branch.

Cheers
  Nick