Function zhetrd_buffer_size 

pub fn zhetrd_buffer_size(
    ctx: &Context,
    fill_mode: FillMode,
    n: usize,
    a: &DeviceMemory<Complex64>,
    lda: usize,
    d: &DeviceMemory<f64>,
    e: &DeviceMemory<f64>,
    tau: &DeviceMemory<Complex64>,
) -> Result<usize>