173   Block *FallthroughSucc{nullptr};  member in llvm::bolt::Block
552         Block.FallthroughSucc = &AllBlocks[SuccIndex];  in mergeFallthroughs()
564           Block.FallthroughSucc = SuccBlock;  in mergeFallthroughs()
575       if (Block.FallthroughSucc == nullptr || Block.FallthroughPred == nullptr)  in mergeFallthroughs()
578       class Block *SuccBlock = Block.FallthroughSucc;  in mergeFallthroughs()
580         SuccBlock = SuccBlock->FallthroughSucc;  in mergeFallthroughs()
585       AllBlocks[Block.FallthroughPred->Index].FallthroughSucc = nullptr;  in mergeFallthroughs()
592           Block.FallthroughSucc != nullptr) {  in mergeFallthroughs()
594         while (CurBlock->FallthroughSucc != nullptr) {  in mergeFallthroughs()
595           class Block *const NextBlock = CurBlock->FallthroughSucc;  in mergeFallthroughs()
719         if (BB1->FallthroughSucc != nullptr) {  in mergeGain()
721           assert(BB1->FallthroughSucc == BB2 && "Fallthrough not preserved");  in mergeGain()