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

[Dmitri Shtilman]

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

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