bifrost: Add support for nir_op_iabs

Signed-off-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6098>
diff --git a/src/panfrost/bifrost/compiler.h b/src/panfrost/bifrost/compiler.h
index 4c77ac5..32361cc 100644
--- a/src/panfrost/bifrost/compiler.h
+++ b/src/panfrost/bifrost/compiler.h
@@ -204,6 +204,7 @@
          * exp2() in GL. In the first argument, it takes f2i_rte(x * 2^24). In
          * the second, it takes x itself. */
         BI_SPECIAL_EXP2_LOW,
+        BI_SPECIAL_IABS,
 };
 
 enum bi_tex_op {