[PATCH] Fix undefined behavior (shift of negative value) in RuntimeDyldMachOAArch64::encodeAddend.

[Chandler Carruth]

(Adding Artem so he sees this)

On Fri, Jan 9, 2015 at 3:48 PM, Alexey Samsonov <vonosmas at gmail.com> wrote:

> Just noticed that a similar fix is already mailed in
> http://reviews.llvm.org/D6884
>

Thanks to both for jumping on this. I prefer casting to masking off the
bits -- it is more self documenting that we lose the 17 high bits.
Otherwise LGTM.
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