libvpx: Pull from upstream

source/libvpx/vp8/common/arm/neon/variance_neon.c

 /*
  *  Copyright (c) 2014 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 <arm_neon.h>
-
-#ifdef _MSC_VER
-#define __builtin_prefetch(x)
-#endif
+#include "vpx_ports/mem.h"
 
 unsigned int vp8_variance16x16_neon(
         const unsigned char *src_ptr,
         int source_stride,
         const unsigned char *ref_ptr,
         int recon_stride,
         unsigned int *sse) {
     int i;
     int16x4_t d22s16, d23s16, d24s16, d25s16, d26s16, d27s16, d28s16, d29s16;
     uint32x2_t d0u32, d10u32;
@@ skipping 288 matching lines @@
 
     q5s64 = vmull_s32(vreinterpret_s32_s64(d0s64),
                       vreinterpret_s32_s64(d0s64));
     vst1_lane_u32((uint32_t *)sse, vreinterpret_u32_s64(d1s64), 0);
 
     d10u32 = vshr_n_u32(vreinterpret_u32_s64(vget_low_s64(q5s64)), 6);
     d0u32 = vsub_u32(vreinterpret_u32_s64(d1s64), d10u32);
 
     return vget_lane_u32(d0u32, 0);
 }