;; the TNs that hold the OLD-FP and RETURN-PC within the function.
;; We always save these so that the debugger can do a backtrace,
;; even if the function has no return (and thus never uses them).
;; the TNs that hold the OLD-FP and RETURN-PC within the function.
;; We always save these so that the debugger can do a backtrace,
;; even if the function has no return (and thus never uses them).