[patch, fortran] Fix PR 86111, ICE on invalid

[Jerry DeLisle]

On 10/6/18 10:53 AM, Thomas Koenig wrote:
> Hello world,
> 
> the attached patch fixes an ICE regression by issuing an error
> when a clever combination of array constructors ends up
> in gfc_arith_concat with mismatched types, before resultion
> has a chance to report the error.
> 
> Regression-tested. OK for trunk?
> 

Looks OK.

Jerry