Fortran: Testsuite, add cyclic pointers.

2016-05-25  Bernhard Heckel  <bernhard.heckel@intel.com>

gdb/testsuite/Changelog:
	* pointers.f90: Add cylic pointers.
	* pointers.exp: Add print of cyclic pointers.

Change-Id: Ic3b6187c5980fd6c37e2e94787f8321e5b7f2d75