pan/bi: Split special class in two

Some special instructions are scheduled on the FMA unit, let's add a
new class for this case and rename the old one accordingly.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7408>
diff --git a/src/panfrost/bifrost/compiler.h b/src/panfrost/bifrost/compiler.h
index 176f7fd..1cb936cf 100644
--- a/src/panfrost/bifrost/compiler.h
+++ b/src/panfrost/bifrost/compiler.h
@@ -73,7 +73,8 @@
         BI_SELECT,
         BI_STORE,
         BI_STORE_VAR,
-        BI_SPECIAL, /* _FAST on supported GPUs */
+        BI_SPECIAL_ADD, /* _FAST on supported GPUs */
+        BI_SPECIAL_FMA, /* _FAST on supported GPUs */
         BI_TABLE,
         BI_TEXS,
         BI_TEXC,