showbc: Refactor to allow inline instruction printing.

py/bc.h

@@ -53,6 +53,8 @@ mp_vm_return_kind_t mp_execute_bytecode(mp_code_state *code_state, volatile mp_o
 void mp_setup_code_state(mp_code_state *code_state, mp_obj_t self_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args);
 void mp_bytecode_print(const void *descr, mp_uint_t n_total_args, const byte *code, mp_uint_t len);
 void mp_bytecode_print2(const byte *code, mp_uint_t len);
+const byte *mp_bytecode_print_str(const byte *ip);
+#define mp_bytecode_print_inst(code) mp_bytecode_print2(code, 1)
 
 // Helper macros to access pointer with least significant bits holding flags
 #define MP_TAGPTR_PTR(x) ((void*)((mp_uint_t)(x) & ~((mp_uint_t)3)))