Scale up exhaustive_search_thresh to work with 128x128 partitions

Also use int instead of int64_t since sf->exhaustive_searches_thresh is
an int and we only make it smaller.

Change-Id: I38c9ebd97f085cb7ce5094dfc98942bb2171ee0f

av1/encoder/mcomp.c

diff --git a/av1/encoder/mcomp.c b/av1/encoder/mcomp.c
index c6e11a5..c77a43c 100644
--- a/av1/encoder/mcomp.c
+++ b/av1/encoder/mcomp.c
@@ -2301,9 +2301,9 @@
 
       // Should we allow a follow on exhaustive search?
       if (is_exhaustive_allowed(cpi, x)) {
-        int64_t exhuastive_thr = sf->exhaustive_searches_thresh;
+        int exhuastive_thr = sf->exhaustive_searches_thresh;
         exhuastive_thr >>=
-            8 - (b_width_log2_lookup[bsize] + b_height_log2_lookup[bsize]);
+            10 - (b_width_log2_lookup[bsize] + b_height_log2_lookup[bsize]);
 
         // Threshold variance for an exhaustive full search.
         if (var > exhuastive_thr) {

av1/encoder/speed_features.c

diff --git a/av1/encoder/speed_features.c b/av1/encoder/speed_features.c
index 0f9ea75..3bf2df0 100644
--- a/av1/encoder/speed_features.c
+++ b/av1/encoder/speed_features.c
@@ -424,9 +424,9 @@
   sf->allow_exhaustive_searches = 1;
   int speed = (oxcf->speed > MAX_MESH_SPEED) ? MAX_MESH_SPEED : oxcf->speed;
   if (cpi->twopass.fr_content_type == FC_GRAPHICS_ANIMATION)
-    sf->exhaustive_searches_thresh = (1 << 22);
+    sf->exhaustive_searches_thresh = (1 << 24);
   else
-    sf->exhaustive_searches_thresh = (1 << 23);
+    sf->exhaustive_searches_thresh = (1 << 25);
   sf->max_exaustive_pct = good_quality_max_mesh_pct[speed];
   if (speed > 0)
     sf->exhaustive_searches_thresh = sf->exhaustive_searches_thresh << 1;