Foundation Classes, NCollection_Vec4 - workaround gcc optimizer issues with xyz() method

  NCollection_Mat4<float> aMatrix;
  aMatrix.Translate (NCollection_Vec3<float> (4.0f, 3.0f, 1.0f));

  NCollection_Vec4<float> aPoints1[8];
  for (int aX = 0; aX < 2; ++aX)
  {
    for (int aY = 0; aY < 2; ++aY)
    {
      for (int aZ = 0; aZ < 2; ++aZ)
      {
        aPoints1[aX * 2 * 2 + aY * 2 + aZ] =
          NCollection_Vec4<float> (-1.0f + 2.0f * float(aX),
                                   -1.0f + 2.0f * float(aY),
                                   -1.0f + 2.0f * float(aZ),
                                    1.0f);
      }
    }
  }

  NCollection_Vec3<float> aPoints2[8];
  for (int aPntIdx = 0; aPntIdx < 8; ++aPntIdx)
  {
    // bug, the evaluation of line below can be dropped by optimizer
    // while retrieving xyz() value the line after
    aPoints1[aPntIdx] = aMatrix * aPoints1[aPntIdx];
    aPoints2[aPntIdx] = aPoints1[aPntIdx].xyz() / aPoints1[aPntIdx].w();
    //aPoints2[aPntIdx] = NCollection_Vec3<float> (aPoints1[aPntIdx].x(),
                                                   aPoints1[aPntIdx].y(),
                                                   aPoints1[aPntIdx].z())
                        / aPoints1[aPntIdx].w();
  }