[PATCH] Change AArch64 to return values in [2 x i64] instead of i128 where possible

[Pete Cooper]

Thanks Tim.  r235231

Pete
> On Apr 17, 2015, at 3:09 PM, Tim Northover <t.p.northover at gmail.com> wrote:
> 
> Hi Pete,
> 
>> Comments welcome.  I’ve added an LLVM test case in r235228, but if you have any other ideas about more extensive testing then let me know.
> 
> I think this looks reasonable.
> 
> Tim.