new do-while syntax

[Rahul Dhesi]

If we're really redesigning the language, a single general construct
suffices:

     do
       ...  /* zero or more statements */
       while condition
       ...  /* zero or more statements */
     done
-- 
Rahul Dhesi         UUCP:  <backbones>!{iuvax,pur-ee}!bsu-cs!dhesi