[PTR-PLUS] Fix Fortran

[Andrew_Pinski@PlayStation.Sony.Com]

Hi,
  Fortran was the easiest front-end I had to fix, it had only one place (I 
could find while testing) that created a PLUS_EXPR with a pointer type.


Committed to the branch after a build/test on i686-linux-gnu with no 
regression.

Thanks,
Andrew Pinski

        * trans-expr.c (gfc_trans_string_copy): Create
        POINTER_PLUS_EXPR instead of a PLUS_EXPR
        for pointer types.

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