Function quantities_for_gemm 

pub fn quantities_for_gemm(
    mt: usize,
    nt: usize,
    kt: usize,
    plan: &BlockPlan,
    fused: bool,
    fidelity: Fidelity,
    target: &SpatialTarget,
) -> PlanQuantities

Structural quantities of a candidate plan, analytically from the plan (the same formulas PlanSummary::dram_tiles_read reproduces from the built structure).