graph's input does not end

[Guy Harris]

>  I noticed a few months ago that "graph" does not work on our
>Sun 4/280 running 4.0.  (It has since gotten the 4.0.1 fixes,
>but I haven't tried it again since then).

Try it now.  4.0.1 purports, in fact, to have two fixes to "graph" on
Sun-4s, one of which is supposed to fix a bug described as "graph(1G)
infinite loops".  I think there was a compiler bug that caused this.