message: Replace '#if 0' comments inside MFEM_FORALL macros with C++ style
  comments.
  These were generating warnings and also seem to break compilation
  with Visual Studio.
diff: @@ -786,16 +786,15 @@ void MassIntegrator::Assemble(const FiniteElementSpace &fes)
  const double J22 = J(1,1,q,e);
  const double detJ = (J11*J22)-(J21*J12);
  // FIXME: this code seems to break the cuda kernel
  -#if 0
  - const Vector3 Xq(x(0,q,e), x(1,q,e));
  - const double coeff =
  - const_coeff ? constant
  - : function_coeff ? function(Xq)
  - : 0.0;
  - v(q,e) = w[q] * coeff * detJ;
  -#else
  + //
  + // const Vector3 Xq(x(0,q,e), x(1,q,e));
  + // const double coeff =
  + // const_coeff ? constant
  + // : function_coeff ? function(Xq)
  + // : 0.0;
  + // v(q,e) = w[q] * coeff * detJ;
  + //
  v(q,e) = w[q] * constant * detJ;
  -#endif
  }
  });
  }
  @@ -834,16 +833,15 @@ void MassIntegrator::Assemble(const FiniteElementSpace &fes)
  /* */ J21 * (J12 * J33 - J32 * J13) +
  /* */ J31 * (J12 * J23 - J22 * J13);
  // FIXME: this code seems to break the cuda kernel
  -#if 0
  - const Vector3 Xq(x(0,q,e), x(1,q,e), x(2,q,e));
  - const double coeff =
  - const_coeff ? constant
  - : function_coeff ? function(Xq)
  - : 0.0;
  - v(q,e) = W[q] * coeff * detJ;
  -#else
  + //
  + // const Vector3 Xq(x(0,q,e), x(1,q,e), x(2,q,e));
  + // const double coeff =
  + // const_coeff ? constant
  + // : function_coeff ? function(Xq)
  + // : 0.0;
  + // v(q,e) = W[q] * coeff * detJ;
  + //
  v(q,e) = W[q] * constant * detJ;
  -#endif
  }
  });
  }
  