[PATCH][X86] Add target combine rules for horizontal add/sub.

[Andrea Di Biagio]

Thanks for the review!
Committed revision 210477.

On Mon, Jun 9, 2014 at 5:20 PM, Nadav Rotem <nrotem at apple.com> wrote:
> Thanks for working on this Andrea.  The patch LGTM.
>
> On Jun 6, 2014, at 12:50 PM, Andrea Di Biagio <andrea.dibiagio at gmail.com> wrote:
>