2017-08-27 Paul Pluzhnikov <ppluzhnikov@google.com>

	* stdlib/Makefile (tst-atexit, tst-at_quick_exit): New tests.
	(tst-cxa_atexit, tst-on_exit): Likewise.
	* stdlib/Makefile (tests): Add tst-atexit, tst-at_quick_exit,
	tst-cxa_atexit, and tst-on_exit.
	* stdlib/tst-atexit-common.c: New file.
	* stdlib/tst-atexit.c: New file.
	* stdlib/tst-at_quick_exit.c: New file.
	* stdlib/tst-cxa_atexit.c: New file.
	* stdlib/tst-on_exit.c: New file.