[flang] Implement passing of assumed-type actual arguments. (#83851)

Passing `TYPE(*)`actual to `TYPE(*)` dummy was left TODO. Implement it.
The difference with other actual arguments is that `TYPE(*)` are not
represented as Fortran::evaluate::Expr<T>, so inquiries on
evaluate::Expr<T> must be updated to use evaluate::ActualArgument or
also handle semantics::Symbol case (except in portion of the code where
`TYPE(*)` is impossible, where asserts are added).