message: Fix reading of branch instructions immediate for parent stack height
diff: @@ -248,7 +248,7 @@ void branch(
  {
  const auto code_offset = read<uint32_t>(immediates);
  const auto imm_offset = read<uint32_t>(immediates);
  - const auto stack_height = static_cast<size_t>(read<int>(immediates));
  + const auto stack_height = static_cast<size_t>(read<uint32_t>(immediates));
  const auto arity = read<uint8_t>(immediates);
  pc = code.instructions.data() + code_offset;
  