pan/bi: Extend bi_scoreboard_state for finer tracking

We need to insert dependencies for varyings and memory access. Currently, the
Bifrost scoreboarding pass just treats these as barriers, but this is too heavy
handed. Extend the scoreboard data structure so we can do better.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16804>

src/panfrost/bifrost/compiler.h

@@ -646,6 +646,10 @@ struct bi_scoreboard_state {
         /** Bitmap of registers read/written by a slot */
         uint64_t read[BI_NUM_SLOTS];
         uint64_t write[BI_NUM_SLOTS];
+
+        /* Nonregister dependencies present by a slot */
+        uint8_t varying : BI_NUM_SLOTS;
+        uint8_t memory : BI_NUM_SLOTS;
 };
 
 typedef struct bi_block {