[patch] Fix for automatic parallelization

[Sebastian Pop]

Hi,

Here is the last fix for the problem that I've reported yesterday,
where gcc failed on the verification of loop structures.  The patch
filters out all the loops that are in irreducible sections.

Another possible way to fix this problem is to mark the newly created
blocks and edges with the irreducible flag, but I'm not sure we want
to parallelize these loops.

Sebastian
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