;; This code has to pathological cases: NO-TLS-VALUE-MARKER
;; or UNBOUND-MARKER as NEW: in either case we would end up
;; doing possible damage with CMPXCHG -- so don't do that!
;; This code has to pathological cases: NO-TLS-VALUE-MARKER
;; or UNBOUND-MARKER as NEW: in either case we would end up
;; doing possible damage with CMPXCHG -- so don't do that!