message: calib3d: use `Mat::reserveBuffer()` instead of `.create()`
  to allocate memory >2Gb
diff: @@ -1492,7 +1492,9 @@ static void computeDisparitySGBM_HH4( const Mat& img1, const Mat& img2,
  if( buffer.empty() || !buffer.isContinuous() ||
  buffer.cols*buffer.rows*buffer.elemSize() < totalBufSize )
  - buffer.create(1, (int)totalBufSize, CV_8U);
  + {
  + buffer.reserveBuffer(totalBufSize);
  + }
  // summary cost over different (nDirs) directions
  CostType* Cbuf = (CostType*)alignPtr(buffer.ptr(), ALIGN);
  