DG-0 table unused

[jorgensd]

Introduced with #405
The following minimal code using DG-0 throws a warning of unused tables:

import ufl
import dolfinx
from mpi4py import MPI

mesh = dolfinx.UnitSquareMesh(MPI.COMM_WORLD, 10, 10)

V = dolfinx.FunctionSpace(mesh, ("Lagrange", 1))
DG0 = dolfinx.FunctionSpace(mesh, ("DG", 0))

lmbda = dolfinx.Function(DG0)


# Define variational problem
v = ufl.TestFunction(V)
dx = ufl.Measure("dx", domain=mesh)
a = lmbda * v * dx
form = dolfinx.Form(a)

libffcx_forms_0ac1fd7dfb180d37cc548c54a90328c2a496a015.c:945:25: warning: unused variable 'FE5_C0_Q083' [-Wunused-variable]
    static const double FE5_C0_Q083[1][1][1][1] = { { { { 1.0 } } } };
                        ^
1 warning generated.

The tabulate_tensor for this code is:

void tabulate_tensor_integral_9ac929c21cb9301c69fd3a82dc1079627a209a20(double* restrict A,
                                    const double* restrict w,
                                    const double* restrict c,
                                    const double* restrict coordinate_dofs,
                                    const int* restrict entity_local_index,
                                    const uint8_t* restrict quadrature_permutation)
{
    // Quadrature rules
    static const double weights_083[1] = { 0.5 };
    // Precomputed values of basis functions and precomputations
    // FE* dimensions: [permutation][entities][points][dofs]
    static const double FE3_C0_Q083[1][1][1][3] = { { { { 0.3333333333333334, 0.3333333333333333, 0.3333333333333333 } } } };
    static const double FE4_C0_D10_Q083[1][1][1][3] = { { { { -1.0, 1.0, 0.0 } } } };
    static const double FE4_C1_D01_Q083[1][1][1][3] = { { { { -1.0, 0.0, 1.0 } } } };
    static const double FE5_C0_Q083[1][1][1][1] = { { { { 1.0 } } } };
    // Quadrature loop independent computations for quadrature rule 083
    const double J_c0 = coordinate_dofs[0] * FE4_C0_D10_Q083[0][0][0][0] + coordinate_dofs[3] * FE4_C0_D10_Q083[0][0][0][1] + coordinate_dofs[6] * FE4_C0_D10_Q083[0][0][0][2];
    const double J_c3 = coordinate_dofs[1] * FE4_C1_D01_Q083[0][0][0][0] + coordinate_dofs[4] * FE4_C1_D01_Q083[0][0][0][1] + coordinate_dofs[7] * FE4_C1_D01_Q083[0][0][0][2];
    const double J_c1 = coordinate_dofs[0] * FE4_C1_D01_Q083[0][0][0][0] + coordinate_dofs[3] * FE4_C1_D01_Q083[0][0][0][1] + coordinate_dofs[6] * FE4_C1_D01_Q083[0][0][0][2];
    const double J_c2 = coordinate_dofs[1] * FE4_C0_D10_Q083[0][0][0][0] + coordinate_dofs[4] * FE4_C0_D10_Q083[0][0][0][1] + coordinate_dofs[7] * FE4_C0_D10_Q083[0][0][0][2];
    double sp_083[5];
    sp_083[0] = J_c0 * J_c3;
    sp_083[1] = J_c1 * J_c2;
    sp_083[2] = sp_083[0] + -1 * sp_083[1];
    sp_083[3] = fabs(sp_083[2]);
    sp_083[4] = sp_083[3] * w[0];
    for (int iq = 0; iq < 1; ++iq)
    {
        const double fw0 = sp_083[4] * weights_083[iq];
        for (int i = 0; i < 3; ++i)
            A[i] += fw0 * FE3_C0_Q083[0][0][0][i];
    }
}

The only difference from the previous commit is the additional table