Remove unused variables for ext-skip

The removed variable was once defined for evaluating the use of
distance-weighted compound prediction for the new skip mode, under
the scenario when all reference frames are forward predicted.

Change-Id: I114daa66d911ec8bb8ef220f7c519566037429b1

av1/common/blockd.h

@@ -671,10 +671,6 @@ typedef struct macroblockd {
 #if CONFIG_JNT_COMP
   JNT_COMP_PARAMS jcp_param;
 #endif
-
-#if CONFIG_EXT_SKIP
-  int all_one_sided_refs;
-#endif  // CONFIG_EXT_SKIP
 } MACROBLOCKD;
 
 static INLINE int get_bitdepth_data_path_index(const MACROBLOCKD *xd) {

av1/decoder/decodeframe.c

@@ -3043,18 +3043,6 @@ static size_t read_uncompressed_header(AV1Decoder *pbi,
 #if CONFIG_EXT_SKIP
   av1_setup_skip_mode_allowed(cm);
   cm->skip_mode_flag = cm->is_skip_mode_allowed ? aom_rb_read_bit(rb) : 0;
-  xd->all_one_sided_refs =
-      frame_is_intra_only(cm) ? 0 : av1_refs_are_one_sided(cm);
-#if 0
-  printf(
-      "DECODER: Frame=%d, frame_offset=%d, show_frame=%d, "
-      "show_existing_frame=%d, is_skip_mode_allowed=%d, "
-      "ref_frame_idx=(%d,%d), reference_mode=%d, "
-      "skip_mode_flag=%d\n\n",
-      cm->current_video_frame, cm->frame_offset, cm->show_frame,
-      cm->show_existing_frame, cm->is_skip_mode_allowed, cm->ref_frame_idx_0,
-      cm->ref_frame_idx_1, cm->reference_mode, cm->skip_mode_flag);
-#endif  // 0
 #endif  // CONFIG_EXT_SKIP
 
   read_compound_tools(cm, rb);

av1/encoder/encodeframe.c

@@ -3829,18 +3829,6 @@ static void encode_frame_internal(AV1_COMP *cpi) {
 
 #if CONFIG_EXT_SKIP
   cm->skip_mode_flag = check_skip_mode_enabled(cpi);
-  xd->all_one_sided_refs = cpi->all_one_sided_refs;
-#if 0
-  printf(
-      "\nENCODER: Frame=%d, frame_offset=%d, show_frame=%d, "
-      "show_existing_frame=%d, is_skip_mode_allowed=%d, "
-      "ref_frame_idx=(%d,%d), reference_mode=%d, "
-      "skip_mode_flag=%d, lag_in_frames=%d\n",
-      cm->current_video_frame, cm->frame_offset, cm->show_frame,
-      cm->show_existing_frame, cm->is_skip_mode_allowed, cm->ref_frame_idx_0,
-      cm->ref_frame_idx_1, cm->reference_mode, cm->skip_mode_flag,
-      cpi->oxcf.lag_in_frames);
-#endif  // 0
 #endif  // CONFIG_EXT_SKIP
 
   {