Tag the REPR function table with the ID the REPR gets, so it's conveniently available.

Author: jnthn

src/6model/repr_registry.c

@@ -35,6 +35,7 @@ static void register_repr(PARROT_INTERP, STRING *name, REPROps *repr) {
         repr_registry = mem_sys_allocate(num_reprs * sizeof(REPROps *));
     repr_registry[ID] = repr;
     VTABLE_set_integer_keyed_str(interp, repr_name_to_id_map, name, ID);
+    repr->ID = ID;
 }
 
 /* Dynamically registers a representation (that is, one defined outside of

src/6model/sixmodelobject.h

@@ -258,6 +258,9 @@ struct SixModel_REPROps {
      * out, the representation probably knows more about timing issues and
      * thread safety requirements. */
     void (*change_type) (PARROT_INTERP, PMC *Object, PMC *NewType);
+    
+    /* The representation's ID. */
+    INTVAL ID;
 };
 
 /* Hint value to indicate the absence of an attribute lookup or method