1322   MachineFunction::iterator FallThrough = MBB->getIterator();  in OptimizeBlock()
1323   ++FallThrough;  in OptimizeBlock()
1327   if (!EHScopeMembership.empty() && FallThrough != MF.end()) {  in OptimizeBlock()
1330     auto FallThroughEHScope = EHScopeMembership.find(&*FallThrough);  in OptimizeBlock()
1352     if (FallThrough == MF.end()) {  in OptimizeBlock()
1354     } else if (FallThrough->isEHPad()) {  in OptimizeBlock()
1359     } else if (MBB->isSuccessor(&*FallThrough)) {  in OptimizeBlock()
1364         Pred->ReplaceUsesOfBlockWith(MBB, &*FallThrough);  in OptimizeBlock()
1370         if (*SI != &*FallThrough && !FallThrough->isSuccessor(*SI)) {  in OptimizeBlock()
1372           FallThrough->copySuccessor(MBB, SI);  in OptimizeBlock()
1377         MJTI->ReplaceMBBInJumpTables(MBB, &*FallThrough);  in OptimizeBlock()
1486         MachineFunction::iterator(PriorTBB) == FallThrough &&  in OptimizeBlock()
1495       if (FallThrough == --MF.end() &&  in OptimizeBlock()
1759       if (FallThrough != MF.end() &&  in OptimizeBlock()
1760           !FallThrough->isEHPad() &&  in OptimizeBlock()
1762           PrevBB.isSuccessor(&*FallThrough)) {  in OptimizeBlock()