Remove unused code

Stats can be collected through the tool of aom_entropy_optimizer using
the dumped file counts.stt.

Change-Id: I121fb6f819841fe09e304c11f83113b27c73afdd

av1/encoder/encoder.c

@@ -287,53 +287,6 @@ static BLOCK_SIZE select_sb_size(const AV1_COMP *const cpi) {
 #endif  //  CONFIG_EXT_PARTITION
 }
 
-#ifdef CONFIG_COLLECT_REF_FRAME_STATS
-static void collect_ref_frame_stats() {
-  AV1_COMMON *const cm = &cpi->common;
-  ThreadData *td = &cpi->td;
-  FRAME_COUNTS *const counts = td->counts;
-  int i, j;
-
-  printf(" %d,", cm->frame_context_idx);
-
-  for (i = 0; i < COMP_INTER_CONTEXTS; ++i) {
-    // 0: single ref i.e. !has_second_ref(mbmi)
-    // 1: comp ref i.e. has_second_ref(mbmi)
-    printf(" %u,", counts->comp_inter[i][0]);
-  }
-
-  for (i = 0; i < COMP_REF_TYPE_CONTEXTS; ++i) {
-    // 0: UNIDIR_COMP_REFERENCE
-    // 1: BIDIR_COMP_REFERENCE
-    printf(" %u,", counts->comp_ref_type[i][0]);
-  }
-
-  // {LAST, LAST2}, {LAST, GOLDEN}, and {BWDREF, ALTREF}
-  for (i = 0; i < UNI_COMP_REF_CONTEXTS; ++i) {
-    for (j = 0; j < (UNIDIR_COMP_REFS - 1); ++j)
-      printf(" %u,", counts->uni_comp_ref[i][j][0]);
-  }
-
-  // Single ref stats
-  for (i = 0; i < REF_CONTEXTS; ++i) {
-    for (j = 0; j < (SINGLE_REFS - 1); ++j)
-      printf(" %u,", counts->single_ref[i][j][0]);
-  }
-
-  // Comp ref stats
-  for (i = 0; i < REF_CONTEXTS; ++i) {
-    for (j = 0; j < (FWD_REFS - 1); ++j)
-      printf(" %u,", counts->comp_ref[i][j][0]);
-  }
-  for (i = 0; i < REF_CONTEXTS; ++i) {
-    for (j = 0; j < (BWD_REFS - 1); ++j)
-      printf(" %u,", counts->comp_bwdref[i][j][0]);
-  }
-
-  printf("\n");
-}
-#endif  // CONFIG_COLLECT_REF_FRAME_STATS
-
 static void setup_frame(AV1_COMP *cpi) {
   AV1_COMMON *const cm = &cpi->common;
   // Set up entropy context depending on frame type. The decoder mandates