[graphite] Fix the graphite BB initialization

[Konrad Trifunovic]

Hi,

I send a very small patch that fixes the initialization of graphite
BB. If not properly initialized, it can cause segmentation faults
during data reference dumping (in function print_graphite_bb).

2008-02-10  Konrad Trifunovic  <konrad.trifunovic@inria.fr>

        * graphite.c (build_graphite_bb): fix initialization
        of the graphite basic block
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