[PATCH] Handle big index in getelementptr instruction for AArch64FastISel

[Chilledheart]

In http://reviews.llvm.org/D9140#159973, @chfast wrote:

> In http://reviews.llvm.org/D9140#159499, @chilledheart wrote:
>
> > Thank you for doing this fix, chfast.
> >
> > I think we can probably copy this test into the directory of each target. Since the target R600 is still falling, we can add the part for R600 separately in a different patch.
>
>
> I'm not convinced about adding the test for every target. I added for arm64 as it was failing and fix is for that target. I don't know any other target beside R600 that fails on that.


Or we can add this test for other targets later.


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