Correctly round sizeof() for code object.

Author: markshannon

Objects/codeobject.c

@@ -1382,8 +1382,10 @@ code_sizeof(PyCodeObject *co, PyObject *Py_UNUSED(args))
     }
 
     if (co->co_quickened != NULL) {
-        res += co->co_quickened[0].entry.zero.cache_count * sizeof(SpecializedCacheEntry);
-        res += PyBytes_GET_SIZE(co->co_code);
+        Py_ssize_t count = co->co_quickened[0].entry.zero.cache_count;
+        count += (PyBytes_GET_SIZE(co->co_code)+sizeof(SpecializedCacheEntry)-1)/
+            sizeof(SpecializedCacheEntry);
+        res += count * sizeof(SpecializedCacheEntry);
     }
 
     return PyLong_FromSsize_t(res);