message: Simplify PABilinearFormExtension::Update()
diff: @@ -134,33 +134,10 @@ void PABilinearFormExtension::Update()
  {
  FiniteElementSpace *fes = a->FESpace();
  height = width = fes->GetVSize();
  - trialFes = fes;
  - testFes = fes;
  - elem_restrict_lex = trialFes->GetElementRestriction(
  - ElementDofOrdering::LEXICOGRAPHIC);
  - if (elem_restrict_lex)
  - {
  - localX.SetSize(elem_restrict_lex->Height());
  - localY.SetSize(elem_restrict_lex->Height());
  - }
  -
  - const int iFISz = a->GetFBFI()->Size();
  - if (int_face_restrict_lex && iFISz>0)
  - {
  - int_face_restrict_lex = trialFes->GetFaceRestriction(
  - ElementDofOrdering::LEXICOGRAPHIC, FaceType::Interior);
  - faceIntX.SetSize(int_face_restrict_lex->Height());
  - faceIntY.SetSize(int_face_restrict_lex->Height());
  - }
  - const int bFISz = a->GetBFBFI()->Size();
  - if (bound_face_restrict_lex && bFISz>0)
  - {
  - bound_face_restrict_lex = trialFes->GetFaceRestriction(
  - ElementDofOrdering::LEXICOGRAPHIC, FaceType::Boundary);
  - faceBdrX.SetSize(bound_face_restrict_lex->Height());
  - faceBdrY.SetSize(bound_face_restrict_lex->Height());
  - }
  + elem_restrict_lex = nullptr;
  + int_face_restrict_lex = nullptr;
  + bound_face_restrict_lex = nullptr;
  }
  void PABilinearFormExtension::FormSystemMatrix(const Array<int> &ess_tdof_list,
  