Fix -finit-derived for c_ptr and c_funptr in programs which use

Fix -finit-derived for c_ptr and c_funptr in programs which use
    iso_c_binding.

    gcc/fortran/ChangeLog:

    2018-06-25  Fritz Reese  <fritzoreese@gmail.com>

	PR fortran/82972
        PR fortran/83088
        PR fortran/85851
	* expr.c (component_initializer): Assign init expr to c->initializer.
	(generate_isocbinding_initializer): New.
	(gfc_generate_initializer): Call generate_isocbinding_initializer to
	generate initializers for c_ptr and c_funptr with -finit-derived.

    gcc/testsuite/ChangeLog:

    2018-06-25  Fritz Reese  <fritzoreese@gmail.com>

	PR fortran/82972
        PR fortran/83088
        PR fortran/85851
	* gfortran.dg/init_flag_17.f90: New testcase.

From-SVN: r262104