post-dominance frontiers: don't add self-loops
post-dominance frontiers: don't add self-loops

useless...

Signed-off-by: Marek Chalupa <a05df156a69ad59faa9af9b666ef78009594c145@gmail.com>

mchalupa/dg,mchalupa/dg,mchalupa/dg,mchalupa/dg