Fix PR fortran/71688

2016-07-19  Martin Jambor  <mjambor@suse.cz>

        PR fortran/71688
        * trans-decl.c (gfc_generate_function_code): Use cgraph_get_create_node
        rather than cgraph_create_node to get a call graph node.

testsuite/
        gfortran.dg/pr71688.f90: New test.

From-SVN: r238476