[PATCH] PR20234 - [SLP Vectorizer] Canonicalize tree operands of commutitive binary operands.

[Chad Rosier]

>>! In D4680#24, @eeckstein wrote:
> yes, the test passes.
> Please let me know if it also gives the same improvement for the benchmark.
> 
> Thanks,
> Erik

If it passes, then we're good.  Please go ahead and revert my patch and apply yours (assuming you've got the LGTM). :)

http://reviews.llvm.org/D4680