Matrix-free FEEvaluation: Avoid indirection in call to sum factorization

[kronbichler]

We simply forward the call to an internal function in

dealii/include/deal.II/matrix_free/evaluation_selector.h

Lines 71 to 82 in 45ca30f

	SelectEvaluator<dim, fe_degree, n_q_points_1d, Number>::evaluate(
	const unsigned int n_components,
	const EvaluationFlags::EvaluationFlags evaluation_flag,
	const Number *values_dofs,
	FEEvaluationData<dim, Number, false> &eval)
	{
	Assert(fe_degree >= 0 && n_q_points_1d > 0, ExcInternalError());
	internal::FEEvaluationImplSelector<dim, Number, false>::template run<
	fe_degree,
	n_q_points_1d>(n_components, evaluation_flag, values_dofs, eval);
	}

so I think we should simply call that function in FEEvaluation::evaluate and FEEvaluation::integrate.