Function build_plan_fused 

pub fn build_plan_fused(
    dims: &[usize],
    strides_list: &[&[isize]],
    dest_index: Option<usize>,
    elem_size: usize,
) -> (Vec<usize>, Vec<Vec<isize>>, KernelPlan)

Build an execution plan with dimension fusion.

Pipeline: order -> reorder -> fuse -> block.