Fix unused variable 'COLORS' warning in optimizer.c

Author: aisk

Python/optimizer.c

@@ -1993,6 +1993,8 @@ find_line_number(PyCodeObject *code, _PyExecutorObject *executor)
 #define BLACK "#000000"
 #define LOOP "#00c000"
 
+#ifdef Py_STATS
+
 static const char *COLORS[10] = {
     "9",
     "8",
@@ -2005,8 +2007,6 @@ static const char *COLORS[10] = {
     "1",
     WHITE,
 };
-
-#ifdef Py_STATS
 const char *
 get_background_color(_PyUOpInstruction const *inst, uint64_t max_hotness)
 {