pan/bi: Link clauses back to their blocks

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5260>
diff --git a/src/panfrost/bifrost/compiler.h b/src/panfrost/bifrost/compiler.h
index fb95c6d..a283f3f 100644
--- a/src/panfrost/bifrost/compiler.h
+++ b/src/panfrost/bifrost/compiler.h
@@ -335,9 +335,14 @@
         bi_instruction *add;
 } bi_bundle;
 
+struct bi_block;
+
 typedef struct {
         struct list_head link;
 
+        /* Link back up for branch calculations */
+        struct bi_block *block;
+
         /* A clause can have 8 instructions in bundled FMA/ADD sense, so there
          * can be 8 bundles. */