[PATCH] [AArch64] Add missing PCRel relocations for AArch64 in RuntimeDyldELF

[Tim Northover]

> Andy's right - we don't want to rule out small code model just because
> some (or even most) memory management schemes wouldn't support it. If
> the client can supply a memory manager that will satisfy the
> constraints of the small code model on their platform then we should
> be able to apply the necessary relocations.

Yep, definitely. I think the relocation support should go in too
(fixed up slightly) and we can deal with the more general testing
later.

Cheers.

Tim.