Issue #22869: Split pythonrun into two modules

- interpreter startup and shutdown code moved to a new
  pylifecycle.c module
- Py_OptimizeFlag moved into the new module with the other
  global flags
diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index 106fc84..6fb882f 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -1681,7 +1681,7 @@
     }
 #endif
 
-    /* stdin/stdout/stderr are now set by pythonrun.c */
+    /* stdin/stdout/stderr are set in pylifecycle.c */
 
     SET_SYS_FROM_STRING_BORROW("__displayhook__",
                                PyDict_GetItemString(sysdict, "displayhook"));