Remove unnecessary memset in build_intra_predictors()

Change-Id: I3064152e2c37ed330adc388e62acc2948a5cea82

av1/common/reconintra.c

@@ -1723,12 +1723,12 @@ static void build_intra_predictors_high(
 #endif  // CONFIG_FILTER_INTRA
   int base = 128 << (xd->bd - 8);
 
-  // base-1 base-1 base-1 .. base-1 base-1 base-1 base-1 base-1 base-1
-  // base+1   A      B  ..     Y      Z
-  // base+1   C      D  ..     W      X
-  // base+1   E      F  ..     U      V
-  // base+1   G      H  ..     S      T      T      T      T      T
-  aom_memset16(left_data, base + 1, sizeof(left_data) / sizeof(*left_data));
+// The default values if ref pixels are not available:
+// base-1 base-1 base-1 .. base-1 base-1 base-1 base-1 base-1 base-1
+// base+1   A      B  ..     Y      Z
+// base+1   C      D  ..     W      X
+// base+1   E      F  ..     U      V
+// base+1   G      H  ..     S      T      T      T      T      T
 
 #if CONFIG_EXT_INTRA
   if (is_dr_mode) {
@@ -1960,13 +1960,13 @@ static void build_intra_predictors(const MACROBLOCKD *xd, const uint8_t *ref,
       xd->mi[0]->mbmi.filter_intra_mode_info.filter_intra_mode;
 #endif  // CONFIG_FILTER_INTRA
 
-  // 127 127 127 .. 127 127 127 127 127 127
-  // 129  A   B  ..  Y   Z
-  // 129  C   D  ..  W   X
-  // 129  E   F  ..  U   V
-  // 129  G   H  ..  S   T   T   T   T   T
-  // ..
-  memset(left_data, 129, sizeof(left_data));
+// The default values if ref pixels are not available:
+// 127 127 127 .. 127 127 127 127 127 127
+// 129  A   B  ..  Y   Z
+// 129  C   D  ..  W   X
+// 129  E   F  ..  U   V
+// 129  G   H  ..  S   T   T   T   T   T
+// ..
 
 #if CONFIG_EXT_INTRA
   if (is_dr_mode) {