Address code review

Author: corona10

Python/ceval_macros.h

@@ -359,15 +359,17 @@ static void dtrace_function_return(_PyInterpreterFrame *);
  * so there is no need to update them. */
 #define ADVANCE_ADAPTIVE_COUNTER(COUNTER) \
     do { \
-        if (!backoff_counter_is_unreachable((COUNTER))) { \
-            (COUNTER) = advance_backoff_counter((COUNTER)); \
+        _Py_BackoffCounter cnt = (COUNTER); \
+        if (!backoff_counter_is_unreachable(cnt)) { \
+            (COUNTER) = advance_backoff_counter(cnt); \
         } \
     } while (0);
 
 #define PAUSE_ADAPTIVE_COUNTER(COUNTER) \
     do { \
-        if (!backoff_counter_is_unreachable((COUNTER))) { \
-            (COUNTER) = pause_backoff_counter((COUNTER)); \
+        _Py_BackoffCounter cnt = (COUNTER); \
+        if (!backoff_counter_is_unreachable(cnt)) { \
+            (COUNTER) = pause_backoff_counter(cnt); \
         } \
     } while (0);
 #else