libvpx: Pull from upstream

source/libvpx/vp9/common/vp9_invtrans.c

-/*
- *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#include "vp9/common/vp9_invtrans.h"
-#include "./vp9_rtcd.h"
-
-void vp9_inverse_transform_b_4x4_add(MACROBLOCKD *xd, int eob, int16_t *dqcoeff,
-                                     uint8_t *dest, int stride) {
-  if (eob <= 1)
-    xd->inv_txm4x4_1_add(dqcoeff, dest, stride);
-  else
-    xd->inv_txm4x4_add(dqcoeff, dest, stride);
-}