rdopt: make ADST_FLIP_SVM array static

Change-Id: Iec280ba1e314849ac027085f61e62a48dd224be4

av1/encoder/rdopt.c

@@ -175,8 +175,12 @@ static const int filter_sets[DUAL_FILTER_SET_SIZE][2] = {
 #define DISABLE_TRELLISQ_SEARCH 0
 #endif
 
-const double ADST_FLIP_SVM[8] = { -6.6623, -2.8062, -3.2531, 3.1671,    // vert
-                                  -7.7051, -3.2234, -3.6193, 3.4533 };  // horz
+static const double ADST_FLIP_SVM[8] = {
+  /* vertical */
+  -6.6623, -2.8062, -3.2531, 3.1671,
+  /* horizontal */
+  -7.7051, -3.2234, -3.6193, 3.4533
+};
 
 typedef struct {
   PREDICTION_MODE mode;