radeonsi/gfx9: add IB parser support

Both GFX6 and GFX9 fields are printed next to each other in parsed IBs.

The Python script parses both headers like one stream and tries to merge
all definitions.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/gallium/drivers/radeonsi/si_debug.c

@@ -26,6 +26,7 @@
 
 #include "si_pipe.h"
 #include "sid.h"
+#include "gfx9d.h"
 #include "sid_tables.h"
 #include "ddebug/dd_util.h"
 #include "util/u_memory.h"