-/// updateUnloop - The last backedge has been removed from a loop--now the
-/// "unloop". Find a new parent for the blocks contained within unloop and
-/// update the loop tree. We don't necessarily have valid dominators at this
-/// point, but LoopInfo is still valid except for the removal of this loop.
-///
-/// Note that Unloop may now be an empty loop. Calling Loop::getHeader without
-/// checking first is illegal.
-void LoopInfo::updateUnloop(Loop *Unloop) {
+void LoopInfo::markAsRemoved(Loop *Unloop) {
+ assert(!Unloop->isInvalid() && "Loop has already been removed");
+ Unloop->invalidate();
+ RemovedLoops.push_back(Unloop);