Revert "ns_subclasses refcount accesses need to be atomic (#15083)" (#15138)

This reverts commit 2998c8d6b99ec49925ebea42198b29c3e27b34a7.

We need to find a better way to fix this bug. Even with this refcount
change, errors were still being seen in CI. For now we need to remove
this failing test.

1 files changed, 1 insertions, 1 deletions

diff --git a/class.c b/class.c
index 550e5422f5..b4b0f556ce 100644
--- a/class.c
+++ b/class.c
@@ -671,7 +671,7 @@ rb_class_classext_free_subclasses(rb_classext_t *ext, VALUE klass, bool replacin
     }
     VM_ASSERT(
         rb_box_subclasses_ref_count(anchor->box_subclasses) > 0,
-        "box_subclasses refcount (%p) %d", anchor->box_subclasses, rb_box_subclasses_ref_count(anchor->box_subclasses));
+        "box_subclasses refcount (%lp) %d", anchor->box_subclasses, rb_box_subclasses_ref_count(anchor->box_subclasses));
     st_delete(tbl, &box_id, NULL);
     rb_box_subclasses_ref_dec(anchor->box_subclasses);
     xfree(anchor);