Fix a crash due to a large stack allocation

Change-Id: Icba19c399531a6e50ab466b606b8921f9b57eae9

av1/common/restoration.c

@@ -640,7 +640,8 @@ static void loop_sgrproj_filter_tile(uint8_t *data, int tile_idx, int width,
   int i, j;
   int h_start, h_end, v_start, v_end;
   uint8_t *data_p;
-  int64_t dat[RESTORATION_TILEPELS_MAX];
+  int64_t *dat = (int64_t *)tmpbuf;
+  tmpbuf = (uint8_t *)tmpbuf + RESTORATION_TILEPELS_MAX * sizeof(*dat);
 
   if (rst->rsi->sgrproj_info[tile_idx].level == 0) return;
   av1_get_rest_tile_limits(tile_idx, 0, 0, rst->nhtiles, rst->nvtiles,
@@ -876,7 +877,8 @@ static void loop_sgrproj_filter_tile_highbd(uint16_t *data, int tile_idx,
   int i, j;
   int h_start, h_end, v_start, v_end;
   uint16_t *data_p;
-  int64_t dat[RESTORATION_TILEPELS_MAX];
+  int64_t *dat = (int64_t *)tmpbuf;
+  tmpbuf = (uint8_t *)tmpbuf + RESTORATION_TILEPELS_MAX * sizeof(*dat);
 
   if (rst->rsi->sgrproj_info[tile_idx].level == 0) return;
   av1_get_rest_tile_limits(tile_idx, 0, 0, rst->nhtiles, rst->nvtiles,

av1/common/restoration.h

@@ -25,7 +25,7 @@ extern "C" {
 #define RESTORATION_TILESIZE_BIG 256
 #define RESTORATION_TILEPELS_MAX \
   (RESTORATION_TILESIZE_BIG * RESTORATION_TILESIZE_BIG * 9 / 4)
-#define SGRPROJ_TMPBUF_SIZE (RESTORATION_TILEPELS_MAX * 5 * 8)
+#define SGRPROJ_TMPBUF_SIZE (RESTORATION_TILEPELS_MAX * 6 * 8)
 
 #define SGRPROJ_PARAMS_BITS 3
 #define SGRPROJ_PARAMS (1 << SGRPROJ_PARAMS_BITS)