message: Fix incorrect use of std::unique
diff: @@ -616,8 +616,10 @@ void Symtab::SortSymbolIndexesByValue(std::vector<uint32_t> &indexes,
  std::stable_sort(indexes.begin(), indexes.end(), comparator);
  // Remove any duplicates if requested
  - if (remove_duplicates)
  - std::unique(indexes.begin(), indexes.end());
  + if (remove_duplicates) {
  + auto last = std::unique(indexes.begin(), indexes.end());
  + indexes.erase(last, indexes.end());
  + }
  }
  uint32_t Symtab::AppendSymbolIndexesWithName(const ConstString &symbol_name,
  