[Polly] Fix parallelism check for reductions

[Doerfert, Johannes]

Hey Tobi,

This is a patch we need to discuss in detail.
I basically tried to fix the loop reversal and modulo problems we discussed earlier.

Do you see any problems whit this way of check for broken dependences?

Best regards,
  Johannes

--

Johannes Doerfert
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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