*ping* [patch, Fortran] Fix PR fortran/68147, temporaries for allocatable strings

[Thomas Koenig]

I wrote:

So, OK for these branches?

Patch at

https://gcc.gnu.org/ml/gcc-patches/2016-02/msg01364.html

Regards

     Thomas

2016-02-18  Thomas Koenig  <tkoe...@gcc.gnu.org>

         PR fortran/68147
         PR fortran/47674
         * frontend-passes.c (realloc_string_callbac): Don't set
         walk_subtrees.

2016-02-18  Thomas Koenig  <tkoe...@gcc.gnu.org>

         PR fortran/68147
         PR fortran/47674
         * gfortran.dg/realloc_on_assign_26.f90:  New test case.