pan/bi: Specify comparison op for BI_CMP

...and adjust printing so we can use it as an op name.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4139>
diff --git a/src/panfrost/bifrost/compiler.h b/src/panfrost/bifrost/compiler.h
index ec1a6f3..cd0408b 100644
--- a/src/panfrost/bifrost/compiler.h
+++ b/src/panfrost/bifrost/compiler.h
@@ -236,6 +236,7 @@
                 enum bi_bitwise_op bitwise;
                 enum bi_round_op round;
                 enum bi_special_op special;
+                enum bi_cond compare;
         } op;
 
         /* Union for class-specific information */