203     SmallVector<MDNode *, 16> POT;                  // Post-order traversal.
212     Metadata &getFwdReference(MDNode &Op);
216   SmallVector<MDNode *, 16> DistinctWorklist;
220   SmallVector<MDNode *, 16> POTStorage;
243   Metadata *map(const MDNode &N);
265   Metadata *mapTopLevelUniquedNode(const MDNode &FirstN);
284   MDNode *mapDistinctNode(const MDNode &N);
303   bool createPOT(UniquedGraph &G, const MDNode &FirstN);
312   MDNode *visitOperands(UniquedGraph &G, MDNode::op_iterator &I,
313                         MDNode::op_iterator E, bool &HasChanged);
334   void remapOperands(MDNode &N, OperandMapper mapOperand);
578   const MDNode &N = *cast<MDNode>(Op);  in tryToMapOperand()
584 MDNode *MDNodeMapper::mapDistinctNode(const MDNode &N) {  in mapDistinctNode()
592     NewM = MDNode::replaceWithDistinct(N.clone());  in mapDistinctNode()
597   DistinctWorklist.push_back(cast<MDNode>(NewM));  in mapDistinctNode()
625 Metadata &MDNodeMapper::UniquedGraph::getFwdReference(MDNode &Op) {  in getFwdReference()
641 void MDNodeMapper::remapOperands(MDNode &N, OperandMapper mapOperand) {  in remapOperands()
659   MDNode *N;              ///< Current node.
660   MDNode::op_iterator Op; ///< Current operand of \c N.
666   POTWorklistEntry(MDNode &N) : N(&N), Op(N.op_begin()) {}  in POTWorklistEntry()
671 bool MDNodeMapper::createPOT(UniquedGraph &G, const MDNode &FirstN) {  in createPOT()
678   Worklist.push_back(POTWorklistEntry(const_cast<MDNode &>(FirstN)));  in createPOT()
683     if (MDNode *N = visitOperands(G, WE.Op, WE.N->op_end(), WE.HasChanged)) {  in createPOT()
703 MDNode *MDNodeMapper::visitOperands(UniquedGraph &G, MDNode::op_iterator &I,  in visitOperands()
704                                     MDNode::op_iterator E, bool &HasChanged) {  in visitOperands()
714     MDNode &OpN = *cast<MDNode>(Op);  in visitOperands()
727     for (MDNode *N : POT) {  in propagateChanges()
745   SmallVector<MDNode *, 16> CyclicNodes;  in mapNodesInPOT()
764       return &G.getFwdReference(*cast<MDNode>(Old));  in mapNodesInPOT()
767     auto *NewN = MDNode::replaceWithUniqued(std::move(ClonedN));  in mapNodesInPOT()
787 Metadata *MDNodeMapper::map(const MDNode &N) {  in map()
801       return mapTopLevelUniquedNode(*cast<MDNode>(Old));  in map()
806 Metadata *MDNodeMapper::mapTopLevelUniquedNode(const MDNode &FirstN) {  in mapTopLevelUniquedNode()
813     for (const MDNode *N : G.POT)  in mapTopLevelUniquedNode()
815     return &const_cast<MDNode &>(FirstN);  in mapTopLevelUniquedNode()
849   assert(isa<MDNode>(MD) && "Expected a metadata node");  in mapSimpleMetadata()
861   return MDNodeMapper(*this).map(*cast<MDNode>(MD));  in mapMetadata()
940   SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;  in remapInstruction()
943     MDNode *Old = MI.second;  in remapInstruction()
944     MDNode *New = cast_or_null<MDNode>(mapMetadata(Old));  in remapInstruction()
991   SmallVector<std::pair<unsigned, MDNode *>, 8> MDs;  in remapGlobalObjectMetadata()
995     GO.addMetadata(I.first, *cast<MDNode>(mapMetadata(I.second)));  in remapGlobalObjectMetadata()
1171 MDNode *ValueMapper::mapMDNode(const MDNode &N) {  in mapMDNode()
1172   return cast_or_null<MDNode>(mapMetadata(N));  in mapMDNode()