Clean-up variables in TplDepStats and RD_OPT

This CL removes the variables 'mc_count' and 'mc_saved' from
TplDepStats structure and 'mc_count_base' and 'mc_saved_base' from
RD_OPT structure.

This CL is verified to be bit-exact with no impact on encode time.

Resolution    Tile    Memory reduction
                      Single   Multi
                      thread   thread
640x360       2x1     0.42%    0.47% (2 threads)
832x480       2x1     0.65%    0.58% (2 threads)
1280x720      2x2     0.77%    0.67% (4 threads)
1920x1080     4x2     0.90%    0.77% (8 threads)

Memory measuring command:
$ command time -v ./aomenc ...

Change-Id: I1ff9df45aa3be44c343b30dfe006833951092fc9
(cherry picked from commit e01597462e2f8d0a22bc6753346203aa5434ebb8)
diff --git a/av1/encoder/encodeframe.c b/av1/encoder/encodeframe.c
index 2f42908..0c3cf6d 100644
--- a/av1/encoder/encodeframe.c
+++ b/av1/encoder/encodeframe.c
@@ -432,7 +432,7 @@
       (cpi->gf_group.update_type[gf_group_index] == ARF_UPDATE ||
        cpi->gf_group.update_type[gf_group_index] == KFFLT_UPDATE)) {
     const int dr =
-        av1_get_rdmult_delta(cpi, sb_size, 0, mi_row, mi_col, orig_rdmult);
+        av1_get_rdmult_delta(cpi, sb_size, mi_row, mi_col, orig_rdmult);
     x->rdmult = dr;
   }
 }
diff --git a/av1/encoder/encodeframe_utils.c b/av1/encoder/encodeframe_utils.c
index 5c9ac9d..7cc3bb7 100644
--- a/av1/encoder/encodeframe_utils.c
+++ b/av1/encoder/encodeframe_utils.c
@@ -647,8 +647,8 @@
 }
 
 #if !CONFIG_REALTIME_ONLY
-int av1_get_rdmult_delta(AV1_COMP *cpi, BLOCK_SIZE bsize, int analysis_type,
-                         int mi_row, int mi_col, int orig_rdmult) {
+int av1_get_rdmult_delta(AV1_COMP *cpi, BLOCK_SIZE bsize, int mi_row,
+                         int mi_col, int orig_rdmult) {
   AV1_COMMON *const cm = &cpi->common;
   const GF_GROUP *const gf_group = &cpi->gf_group;
   assert(IMPLIES(cpi->gf_group.size > 0,
@@ -670,7 +670,6 @@
 
   if (cpi->gf_group.index >= MAX_TPL_FRAME_IDX) return orig_rdmult;
 
-  int64_t mc_count = 0, mc_saved = 0;
   int mi_count = 0;
   const int mi_col_sr =
       coded_to_superres_mi(mi_col, cm->superres_scale_denominator);
@@ -688,8 +687,6 @@
                  this_stats->mc_dep_dist);
       intra_cost += this_stats->recrf_dist << RDDIV_BITS;
       mc_dep_cost += (this_stats->recrf_dist << RDDIV_BITS) + mc_dep_delta;
-      mc_count += this_stats->mc_count;
-      mc_saved += this_stats->mc_saved;
       mi_count++;
     }
   }
@@ -697,20 +694,10 @@
   aom_clear_system_state();
 
   double beta = 1.0;
-  if (analysis_type == 0) {
-    if (mc_dep_cost > 0 && intra_cost > 0) {
-      const double r0 = cpi->rd.r0;
-      const double rk = (double)intra_cost / mc_dep_cost;
-      beta = (r0 / rk);
-    }
-  } else if (analysis_type == 1) {
-    const double mc_count_base = (mi_count * cpi->rd.mc_count_base);
-    beta = (mc_count + 1.0) / (mc_count_base + 1.0);
-    beta = pow(beta, 0.5);
-  } else if (analysis_type == 2) {
-    const double mc_saved_base = (mi_count * cpi->rd.mc_saved_base);
-    beta = (mc_saved + 1.0) / (mc_saved_base + 1.0);
-    beta = pow(beta, 0.5);
+  if (mc_dep_cost > 0 && intra_cost > 0) {
+    const double r0 = cpi->rd.r0;
+    const double rk = (double)intra_cost / mc_dep_cost;
+    beta = (r0 / rk);
   }
 
   int rdmult = av1_get_adaptive_rdmult(cpi, beta);
@@ -855,7 +842,6 @@
 
   if (cpi->gf_group.index >= MAX_TPL_FRAME_IDX) return base_qindex;
 
-  int64_t mc_count = 0, mc_saved = 0;
   int mi_count = 0;
   const int mi_col_sr =
       coded_to_superres_mi(mi_col, cm->superres_scale_denominator);
@@ -873,8 +859,6 @@
                  this_stats->mc_dep_dist);
       intra_cost += this_stats->recrf_dist << RDDIV_BITS;
       mc_dep_cost += (this_stats->recrf_dist << RDDIV_BITS) + mc_dep_delta;
-      mc_count += this_stats->mc_count;
-      mc_saved += this_stats->mc_saved;
       mi_count++;
     }
   }
diff --git a/av1/encoder/encodeframe_utils.h b/av1/encoder/encodeframe_utils.h
index 91ea1ef..e8ff43b 100644
--- a/av1/encoder/encodeframe_utils.h
+++ b/av1/encoder/encodeframe_utils.h
@@ -249,8 +249,8 @@
   }
 }
 
-int av1_get_rdmult_delta(AV1_COMP *cpi, BLOCK_SIZE bsize, int analysis_type,
-                         int mi_row, int mi_col, int orig_rdmult);
+int av1_get_rdmult_delta(AV1_COMP *cpi, BLOCK_SIZE bsize, int mi_row,
+                         int mi_col, int orig_rdmult);
 
 int av1_active_h_edge(const AV1_COMP *cpi, int mi_row, int mi_step);
 
diff --git a/av1/encoder/encoder_utils.c b/av1/encoder/encoder_utils.c
index eab3442..754b4a6 100644
--- a/av1/encoder/encoder_utils.c
+++ b/av1/encoder/encoder_utils.c
@@ -369,8 +369,6 @@
     int tpl_stride = tpl_frame->stride;
     int64_t intra_cost_base = 0;
     int64_t mc_dep_cost_base = 0;
-    int64_t mc_saved_base = 0;
-    int64_t mc_count_base = 0;
     const int step = 1 << tpl_data->tpl_stats_block_mis_log2;
     const int mi_cols_sr = av1_pixels_to_mi(cm->superres_upscaled_width);
 
@@ -384,8 +382,6 @@
         intra_cost_base += (this_stats->recrf_dist << RDDIV_BITS);
         mc_dep_cost_base +=
             (this_stats->recrf_dist << RDDIV_BITS) + mc_dep_delta;
-        mc_count_base += this_stats->mc_count;
-        mc_saved_base += this_stats->mc_saved;
       }
     }
 
@@ -412,10 +408,6 @@
               cpi->rc.gfu_boost, gfu_boost, cpi->rc.frames_to_key);
         }
       }
-      cpi->rd.mc_count_base = (double)mc_count_base /
-                              (cm->mi_params.mi_rows * cm->mi_params.mi_cols);
-      cpi->rd.mc_saved_base = (double)mc_saved_base /
-                              (cm->mi_params.mi_rows * cm->mi_params.mi_cols);
       aom_clear_system_state();
     }
   }
diff --git a/av1/encoder/rd.h b/av1/encoder/rd.h
index ff6010a..0f0062b 100644
--- a/av1/encoder/rd.h
+++ b/av1/encoder/rd.h
@@ -79,7 +79,6 @@
   int RDMULT;
 
   double r0;
-  double mc_saved_base, mc_count_base;
 } RD_OPT;
 
 typedef struct {
diff --git a/av1/encoder/tpl_model.h b/av1/encoder/tpl_model.h
index 85b3b9f..a63d1a4 100644
--- a/av1/encoder/tpl_model.h
+++ b/av1/encoder/tpl_model.h
@@ -94,8 +94,6 @@
   int_mv mv[INTER_REFS_PER_FRAME];
   int ref_frame_index;
   int64_t pred_error[INTER_REFS_PER_FRAME];
-  int64_t mc_count;
-  int64_t mc_saved;
 } TplDepStats;
 
 typedef struct TplDepFrame {