message: generator: add more radix-7 sizes
diff: @@ -54,7 +54,10 @@ int generate_support_size_list(std::vector<size_t>& support_size_list,
  // pick relatively common radix-7 sizes - radix-7 in general is
  // not common enough to justify generating every combination
  support_size_list.push_back(7);
  + support_size_list.push_back(28);
  support_size_list.push_back(49);
  + support_size_list.push_back(42);
  + support_size_list.push_back(56);
  support_size_list.push_back(84);
  support_size_list.push_back(112);
  