py: Add constant table to bytecode.

Contains just argument names at the moment but makes it easy to add
arbitrary constants.
diff --git a/py/emitglue.h b/py/emitglue.h
index 56029b3..9bb2ba2 100644
--- a/py/emitglue.h
+++ b/py/emitglue.h
@@ -43,8 +43,8 @@
 
 mp_raw_code_t *mp_emit_glue_new_raw_code(void);
 
-void mp_emit_glue_assign_bytecode(mp_raw_code_t *rc, byte *code, mp_uint_t len, mp_uint_t scope_flags);
-void mp_emit_glue_assign_native(mp_raw_code_t *rc, mp_raw_code_kind_t kind, void *fun_data, mp_uint_t fun_len, mp_uint_t n_pos_args, mp_uint_t scope_flags, mp_uint_t type_sig);
+void mp_emit_glue_assign_bytecode(mp_raw_code_t *rc, const byte *code, mp_uint_t len, const mp_uint_t *const_table, mp_uint_t scope_flags);
+void mp_emit_glue_assign_native(mp_raw_code_t *rc, mp_raw_code_kind_t kind, void *fun_data, mp_uint_t fun_len, const mp_uint_t *const_table, mp_uint_t n_pos_args, mp_uint_t scope_flags, mp_uint_t type_sig);
 
 mp_obj_t mp_make_function_from_raw_code(mp_raw_code_t *rc, mp_obj_t def_args, mp_obj_t def_kw_args);
 mp_obj_t mp_make_closure_from_raw_code(mp_raw_code_t *rc, mp_uint_t n_closed_over, const mp_obj_t *args);