Function emit_runtime_chain 

fn emit_runtime_chain<W: Write>(
    w: &mut W,
    func: &Function,
    cfg: &FunctionCfg,
    chain: &[usize],
    callee_args: &BTreeMap<u32, u8>,
    non_volatile_count: u16,
    volatile_count: u16,
    indent: &str,
) -> Result<()>