451         LoopHeaders.erase(&BB);  in runImpl()
468             !LoopHeaders.count(&BB) && !LoopHeaders.count(Succ) &&  in runImpl()
481   LoopHeaders.clear();  in runImpl()
614     LoopHeaders.insert(Edge.second);  in findLoopHeaders()
1631   if (LoopHeaders.count(BB))  in processThreadableEdges()
1771                return LoopHeaders.contains(PredToDest.second);  in processThreadableEdges()
1987   if (LoopHeaders.erase(SinglePred))  in maybeMergeBasicBlockIntoOnlyPred()
1988     LoopHeaders.insert(BB);  in maybeMergeBasicBlockIntoOnlyPred()
2175   if (LoopHeaders.count(PredBB))  in maybethreadThroughTwoBasicBlocks()
2223   if (LoopHeaders.count(BB) || LoopHeaders.count(SuccBB)) {  in maybethreadThroughTwoBasicBlocks()
2225       bool BBIsHeader = LoopHeaders.count(BB);  in maybethreadThroughTwoBasicBlocks()
2226       bool SuccIsHeader = LoopHeaders.count(SuccBB);  in maybethreadThroughTwoBasicBlocks()
2337   if (LoopHeaders.count(BB) || LoopHeaders.count(SuccBB)) {  in tryThreadEdge()
2339       bool BBIsHeader = LoopHeaders.count(BB);  in tryThreadEdge()
2340       bool SuccIsHeader = LoopHeaders.count(SuccBB);  in tryThreadEdge()
2369   assert(!LoopHeaders.count(BB) && !LoopHeaders.count(SuccBB) &&  in threadEdge()
2611   if (LoopHeaders.count(BB)) {  in duplicateCondBranchOnPHIIntoPred()
2875   if (LoopHeaders.count(BB))  in tryToUnfoldSelectInCurrBB()