libvpx: Pull from upstream

source/libvpx/third_party/libyuv/source/compare.cc

 /*
  *  Copyright 2011 The LibYuv 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.
  */
 
@@ skipping 62 matching lines @@
   }
   remainder = (int)(count) & 15;
   if (remainder) {
     seed = HashDjb2_C(src, remainder, seed);
   }
   return seed;
 }
 
 uint32 SumSquareError_C(const uint8* src_a, const uint8* src_b, int count);
 #if !defined(LIBYUV_DISABLE_NEON) && \
-    (defined(__ARM_NEON__) || defined(LIBYUV_NEON))
+    (defined(__ARM_NEON__) || defined(LIBYUV_NEON) || defined(__aarch64__))
 #define HAS_SUMSQUAREERROR_NEON
 uint32 SumSquareError_NEON(const uint8* src_a, const uint8* src_b, int count);
 #endif
 #if !defined(LIBYUV_DISABLE_X86) && \
     (defined(_M_IX86) || defined(__x86_64__) || defined(__i386__))
 #define HAS_SUMSQUAREERROR_SSE2
 uint32 SumSquareError_SSE2(const uint8* src_a, const uint8* src_b, int count);
 #endif
 // Visual C 2012 required for AVX2.
 #if !defined(LIBYUV_DISABLE_X86) && defined(_M_IX86) && _MSC_VER >= 1700
@@ skipping 222 matching lines @@
   const double ssim_v = CalcFrameSsim(src_v_a, stride_v_a,
                                       src_v_b, stride_v_b,
                                       width_uv, height_uv);
   return ssim_y * 0.8 + 0.1 * (ssim_u + ssim_v);
 }
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif