[PATCH] Reassociate: optimize I1 + x - I2 into x when I1 and I2 are identical

[Dmitri Shtilman]

Chad, could you take a look?

> On Sep 24, 2014, at 3:49 PM, Dmitri Shtilman <dshtilman at icloud.com> wrote:
> 
> Hi all,
> 
> The following small patch gives the Reassociate pass a bit more flexibility and autonomy when optimizing expressions.
> Particularly, it addresses cases where Reassociate breaks Subtracts but then fails to optimize combinations like I1 + -I2 where I1 and I2 have the same rank and are identical.
> 
> Please review.
> Dmitri
> 
> <Reassociate.patch>
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