[patch][graphite] Fix code generated by Graphite for vectorization

[Sebastian Pop]

Hi,

The two patches 0002 and 0003 are needed to improve the vectorization
of the code generated by Graphite.  0001 is a first step towards
pretty printing the SCoPs under the scoplib format.  I bootstrapped
and tested the attached patches in the Graphite branch, Java disabled,
as the Java libs are not building for now.  Ok for trunk?

Thanks,
Sebastian
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