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);
285   MDNode *mapDistinctNode(const MDNode &N);
304   bool createPOT(UniquedGraph &G, const MDNode &FirstN);
313   MDNode *visitOperands(UniquedGraph &G, MDNode::op_iterator &I,
314                         MDNode::op_iterator E, bool &HasChanged);
334   void remapOperands(MDNode &N, OperandMapper mapOperand);
624   const MDNode &N = *cast<MDNode>(Op);  in tryToMapOperand()
630 MDNode *MDNodeMapper::mapDistinctNode(const MDNode &N) {  in mapDistinctNode()
638     NewM = MDNode::replaceWithDistinct(N.clone());  in mapDistinctNode()
643   DistinctWorklist.push_back(cast<MDNode>(NewM));  in mapDistinctNode()
671 Metadata &MDNodeMapper::UniquedGraph::getFwdReference(MDNode &Op) {  in getFwdReference()
687 void MDNodeMapper::remapOperands(MDNode &N, OperandMapper mapOperand) {  in remapOperands()
705   MDNode *N;              ///< Current node.
706   MDNode::op_iterator Op; ///< Current operand of \c N.
712   POTWorklistEntry(MDNode &N) : N(&N), Op(N.op_begin()) {}  in POTWorklistEntry()
717 bool MDNodeMapper::createPOT(UniquedGraph &G, const MDNode &FirstN) {  in createPOT()
724   Worklist.push_back(POTWorklistEntry(const_cast<MDNode &>(FirstN)));  in createPOT()
729     if (MDNode *N = visitOperands(G, WE.Op, WE.N->op_end(), WE.HasChanged)) {  in createPOT()
749 MDNode *MDNodeMapper::visitOperands(UniquedGraph &G, MDNode::op_iterator &I,  in visitOperands()
750                                     MDNode::op_iterator E, bool &HasChanged) {  in visitOperands()
760     MDNode &OpN = *cast<MDNode>(Op);  in visitOperands()
773     for (MDNode *N : POT) {  in propagateChanges()
791   SmallVector<MDNode *, 16> CyclicNodes;  in mapNodesInPOT()
810       return &G.getFwdReference(*cast<MDNode>(Old));  in mapNodesInPOT()
813     auto *NewN = MDNode::replaceWithUniqued(std::move(ClonedN));  in mapNodesInPOT()
833 Metadata *MDNodeMapper::map(const MDNode &N) {  in map()
847       return mapTopLevelUniquedNode(*cast<MDNode>(Old));  in map()
852 Metadata *MDNodeMapper::mapTopLevelUniquedNode(const MDNode &FirstN) {  in mapTopLevelUniquedNode()
859     for (const MDNode *N : G.POT)  in mapTopLevelUniquedNode()
861     return &const_cast<MDNode &>(FirstN);  in mapTopLevelUniquedNode()
895   assert(isa<MDNode>(MD) && "Expected a metadata node");  in mapSimpleMetadata()
907   return MDNodeMapper(*this).map(*cast<MDNode>(MD));  in mapMetadata()
986   SmallVector<std::pair<unsigned, MDNode *>, 4> MDs;  in remapInstruction()
989     MDNode *Old = MI.second;  in remapInstruction()
990     MDNode *New = cast_or_null<MDNode>(mapMetadata(Old));  in remapInstruction()
1037   SmallVector<std::pair<unsigned, MDNode *>, 8> MDs;  in remapGlobalObjectMetadata()
1041     GO.addMetadata(I.first, *cast<MDNode>(mapMetadata(I.second)));  in remapGlobalObjectMetadata()
1217 MDNode *ValueMapper::mapMDNode(const MDNode &N) {  in mapMDNode()
1218   return cast_or_null<MDNode>(mapMetadata(N));  in mapMDNode()