fix: make assertion tier 2 frame aware (python#37)

Author: Fidget-Spinner

Python/ceval_macros.h

@@ -142,7 +142,7 @@ GETITEM(PyObject *v, Py_ssize_t i) {
 /* The integer overflow is checked by an assertion below. */
 // TODO change this calculation when interpreter is bb aware.
 #define INSTR_OFFSET() ((int)(next_instr - \
-    (frame->f_code->_tier2_info == NULL ? _PyCode_CODE(frame->f_code) : frame->f_code->_tier2_info->_bb_space->u_code)))
+    (frame->is_tier2 && frame->f_code->_tier2_info != NULL ? frame->f_code->_tier2_info->_bb_space->u_code : _PyCode_CODE(frame->f_code))))
 #define NEXTOPARG()  do { \
         _Py_CODEUNIT word = *next_instr; \
         opcode = word.op.code; \