[PATCH] Clang and AArch64 backend patches to support arm v8 Neon

[Tim Northover]

Hi Ana,

Thanks for updating the patches.

> If you are happy with them now, please proceed with merging.

Do you have commit access yet? If not, I'll commit them for you
tomorrow (assuming no-one else protests overnight). That should give
me a day to fixup any bots that *do* complain.

> In the meanwhile I will look into Jim's suggestion to use RegisterOperand
> for Neon registers.

Thanks.

Tim.