[polly] r183799 - scop detection: remove an iteration over all uses

[Sebastian Pop]

Tobias Grosser wrote:
> If the patch is tested and does not cause any regressions on the
> LLVM test suite, please just remove the asserts and commit the test
> case. If this check still causes regressions on the test suite or
> was never tested on it, please remove it until you find time to test
> it.

I reverted this change on r184128 until I get it correctly tested.

Thanks,
Sebastian
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