pan/bi: Add quirks system

Modeled after the Midgard system. Already we know of two
compiler-visible differences between G52 and G71, so let's keep track so
we can eventually port the compiler to other Bifrost systems.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4061>
diff --git a/src/panfrost/bifrost/compiler.h b/src/panfrost/bifrost/compiler.h
index 7ffe9e5..04a0c39 100644
--- a/src/panfrost/bifrost/compiler.h
+++ b/src/panfrost/bifrost/compiler.h
@@ -318,6 +318,7 @@
 typedef struct {
        nir_shader *nir;
        struct list_head blocks; /* list of bi_block */
+       uint32_t quirks;
 } bi_context; 
 
 /* So we can distinguish between SSA/reg/sentinel quickly */