*ping* [patch, fortran] PR 30146, errors for INTENT(OUT) and INTENT(INOUT) for DO loop variables

[Thomas Koenig]

I wrote:

after the dicsussion on c.l.f, it become clear that passing a DO loop
variable to an INTENT(OUT) or INTENT(INOUT) dummy argument is an error.
The attached patch throws an error for both cases.

I chose to issue the errors as a front-end pass because we cannot check
for formal arguments during parsing (where the other checks are
implemented).

Regression-tested.  OK for trunk?

Ping ** 1.4285 ?

        Thomas