[patch, fortran] Fix PR 65428, ICE on nested empty array constructors

[Thomas Koenig]

Hi Tobias,

> I am not completely happy about the introduction of yet another two 
> global variables, but I also do not see an easy way out. Hence: OK.

Actually, I wasn't too happy myself, but, like you, I didn't find
anything better.

> I was playing around with the following test case – you might consider 
> to add them as well. (I would exclude the error item, however.)

I have also added this as a test case.

Committed as r280063 (without the spaces at the end of the
lines that you pointed out in a separate mail).

Thanks for the review!

Regards

	Thomas