PATCH: CALL_EXPR representation part 0/9 (table of contents)

[Richard Kenner]

> This change breaks the Ada front end.  Back last year when I undertook this 
> project on the LTO branch, the Ada maintainers said they would take 
> responsibility for updating their code if/when the changes made it back to 
> mainline.

I just checked and there are exactly 11 uses of CALL_EXPR in the Ada front
end.  So it doesn't sound like any large amount of work.