More commentary.

From-SVN: r19971

gcc/testsuite/g77.f-torture/execute/980520-1.f

 c     Produced a link error through not eliminating the unused statement
-c     function.  It's in `execute' since it needs to link.
+c     function after 1998-05-15 change to gcc/toplev.c.  It's in
+c     `execute' since it needs to link.
+c     Fixed by 1998-05-23 change to f/com.c.
       values(i,j) = val((i-1)*n+j)
       end