libvpx: Pull from upstream

source/libvpx/vp9/common/mips/msa/vp9_idct8x8_msa.c

 /*
  *  Copyright (c) 2015 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 <assert.h>
 #include "vp9/common/mips/msa/vp9_idct_msa.h"
 
 void vp9_idct8x8_64_add_msa(const int16_t *input, uint8_t *dst,
                             int32_t dst_stride) {
   v8i16 in0, in1, in2, in3, in4, in5, in6, in7;
 
   /* load vector elements of 8x8 block */
   LD_SH8(input, 8, in0, in1, in2, in3, in4, in5, in6, in7);
 
   /* rows transform */
@@ skipping 152 matching lines @@
 
   /* final rounding (add 2^4, divide by 2^5) and shift */
   SRARI_H4_SH(in0, in1, in2, in3, 5);
   SRARI_H4_SH(in4, in5, in6, in7, 5);
 
   /* add block and store 8x8 */
   VP9_ADDBLK_ST8x4_UB(dst, dst_stride, in0, in1, in2, in3);
   dst += (4 * dst_stride);
   VP9_ADDBLK_ST8x4_UB(dst, dst_stride, in4, in5, in6, in7);
 }