49     const llvm::SmallVector<FrameIdTy> *CallStack,  in encodeCallStack()  argument
55     auto Pos = std::mismatch(Prev->rbegin(), Prev->rend(), CallStack->rbegin(),  in encodeCallStack()
56                              CallStack->rend());  in encodeCallStack()
57     CommonLen = std::distance(CallStack->rbegin(), Pos.second);  in encodeCallStack()
75   assert(CommonLen <= CallStack->size());  in encodeCallStack()
76   for (FrameIdTy F : llvm::drop_begin(llvm::reverse(*CallStack), CommonLen)) {  in encodeCallStack()
82   assert(CallStack->size() == Indexes.size());  in encodeCallStack()
85   RadixArray.push_back(CallStack->size());  in encodeCallStack()
200   for (const auto &[CSId, CallStack] : llvm::reverse(CallStacks)) {  in build()
202         encodeCallStack(&CallStack, Prev, MemProfFrameIndexes);  in build()
204     Prev = &CallStack;  in build()