pan/bi: remove unused debug output

There's no more users left of this switch or macro, so let's just get
rid of it.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33710>

src/panfrost/compiler/bifrost_compile.c

@@ -42,7 +42,6 @@
 
 /* clang-format off */
 static const struct debug_named_value bifrost_debug_options[] = {
-   {"msgs",       BIFROST_DBG_MSGS,		   "Print debug messages"},
    {"shaders",    BIFROST_DBG_SHADERS,	   "Dump shaders in NIR and MIR"},
    {"shaderdb",   BIFROST_DBG_SHADERDB,	"Print statistics"},
    {"verbose",    BIFROST_DBG_VERBOSE,	   "Disassemble verbosely"},
@@ -69,12 +68,6 @@ DEBUG_GET_ONCE_FLAGS_OPTION(bifrost_debug, "BIFROST_MESA_DEBUG",
 
 int bifrost_debug = 0;
 
-#define DBG(fmt, ...)                                                          \
-   do {                                                                        \
-      if (bifrost_debug & BIFROST_DBG_MSGS)                                    \
-         fprintf(stderr, "%s:%d: " fmt, __func__, __LINE__, ##__VA_ARGS__);    \
-   } while (0)
-
 static bi_block *emit_cf_list(bi_context *ctx, struct exec_list *list);
 
 static bi_index