[Melt] Fix foreach_edge_bb_precs

[Romain Geissler]

Hello,

This iteratoc won't work because of a little typo error (the previous
edge field is preDs and not preCs).
To avoid future errors, i apply the global /precs/preds/ change (and
thus the iterator is renamed).

Romain Geissler

Changelog
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foreach_edge_bb_preds.diff
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