To remove the exit block, it cannot have successors, if this edge is not
removed, when applying the updates to the DT the following assertion
will appear:
"Assertion `Node->isLeaf() && "Node is not a leaf node."' failed"
This assertion does not always fail because before applying the updates
on the "GenericDomTreeContruction", "ApplyUpdates" function it runs
CalculateFromScratch on some situations:
// Make unittests of the incremental algorithm work
if (DT.DomTreeNodes.size() <= 100) {
if (BUI.NumLegalized > DT.DomTreeNodes.size())
CalculateFromScratch(DT, &BUI);
} else if (BUI.NumLegalized > DT.DomTreeNodes.size() / 40)
CalculateFromScratch(DT, &BUI);
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