444         LoopHeaders.erase(&BB);  in runImpl()
461             !LoopHeaders.count(&BB) && !LoopHeaders.count(Succ) &&  in runImpl()
474   LoopHeaders.clear();  in runImpl()
604     LoopHeaders.insert(Edge.second);  in findLoopHeaders()
1616   if (LoopHeaders.count(BB))  in processThreadableEdges()
1754                return LoopHeaders.contains(PredToDest.second);  in processThreadableEdges()
1969   if (LoopHeaders.erase(SinglePred))  in maybeMergeBasicBlockIntoOnlyPred()
1970     LoopHeaders.insert(BB);  in maybeMergeBasicBlockIntoOnlyPred()
2157   if (LoopHeaders.count(PredBB))  in maybethreadThroughTwoBasicBlocks()
2208   if (LoopHeaders.count(BB) || LoopHeaders.count(SuccBB)) {  in maybethreadThroughTwoBasicBlocks()
2210       bool BBIsHeader = LoopHeaders.count(BB);  in maybethreadThroughTwoBasicBlocks()
2211       bool SuccIsHeader = LoopHeaders.count(SuccBB);  in maybethreadThroughTwoBasicBlocks()
2322   if (LoopHeaders.count(BB) || LoopHeaders.count(SuccBB)) {  in tryThreadEdge()
2324       bool BBIsHeader = LoopHeaders.count(BB);  in tryThreadEdge()
2325       bool SuccIsHeader = LoopHeaders.count(SuccBB);  in tryThreadEdge()
2354   assert(!LoopHeaders.count(BB) && !LoopHeaders.count(SuccBB) &&  in threadEdge()
2596   if (LoopHeaders.count(BB)) {  in duplicateCondBranchOnPHIIntoPred()
2860   if (LoopHeaders.count(BB))  in tryToUnfoldSelectInCurrBB()