405   SmallVector<std::unique_ptr<WriterContext>, 4> Contexts;  in mergeInstrProfile()  local
407     Contexts.emplace_back(std::make_unique<WriterContext>(  in mergeInstrProfile()
413                 Contexts[0].get());  in mergeInstrProfile()
421                  Contexts[Ctx].get());  in mergeInstrProfile()
427     unsigned Mid = Contexts.size() / 2;  in mergeInstrProfile()
428     unsigned End = Contexts.size();  in mergeInstrProfile()
432         Pool.async(mergeWriterContexts, Contexts[I].get(),  in mergeInstrProfile()
433                    Contexts[I + Mid].get());  in mergeInstrProfile()
436         Pool.async(mergeWriterContexts, Contexts[0].get(),  in mergeInstrProfile()
437                    Contexts[End - 1].get());  in mergeInstrProfile()
448   for (std::unique_ptr<WriterContext> &WC : Contexts) {  in mergeInstrProfile()
458   writeInstrProfile(OutputFilename, OutputFormat, Contexts[0]->Writer);  in mergeInstrProfile()