Function moe_expert_gate_up_shared_batch2_t 

pub fn moe_expert_gate_up_shared_batch2_t(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    input: DevicePtr,
    gate_packed_t_ptrs: DevicePtr,
    gate_scale_t_ptrs: DevicePtr,
    gate_scale2_vals: DevicePtr,
    gate_out: DevicePtr,
    up_packed_t_ptrs: DevicePtr,
    up_scale_t_ptrs: DevicePtr,
    up_scale2_vals: DevicePtr,
    up_out: DevicePtr,
    expert_indices: DevicePtr,
    sh_gate_t: &QuantizedWeight,
    sh_gate_out: DevicePtr,
    sh_up_t: &QuantizedWeight,
    sh_up_out: DevicePtr,
    n: u32,
    k: u32,
    top_k: u32,
    stream: u64,
) -> Result<()>

NVFP4 fused gate+up GEMV (transposed). K=2 batch.