Function daala_fdst_iv_16

fn daala_fdst_iv_16<T: TxOperations>(
    s0: T,
    s1: T,
    s2: T,
    s3: T,
    s4: T,
    s5: T,
    s6: T,
    s7: T,
    s8: T,
    s9: T,
    sa: T,
    sb: T,
    sc: T,
    sd: T,
    se: T,
    sf: T,
    output: &mut [T],
)