libvpx: Pull from upstream

source/libvpx/vp9/common/vp9_mv.h

 /*
  *  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.
  */
 
@@ skipping 16 matching lines @@
 typedef union int_mv {
   uint32_t as_int;
   MV as_mv;
 } int_mv; /* facilitates faster equality tests and copies */
 
 typedef struct mv32 {
   int32_t row;
   int32_t col;
 } MV32;
 
+static INLINE int is_zero_mv(const MV *mv) {
+  return *((const uint32_t *)mv) == 0;
+}
+
+static INLINE int is_equal_mv(const MV *a, const MV *b) {
+  return  *((const uint32_t *)a) == *((const uint32_t *)b);
+}
+
 static INLINE void clamp_mv(MV *mv, int min_col, int max_col,
                             int min_row, int max_row) {
   mv->col = clamp(mv->col, min_col, max_col);
   mv->row = clamp(mv->row, min_row, max_row);
 }
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // VP9_COMMON_VP9_MV_H_