e.53.4.c: Add -DITESTITERS=20 to dg-options unless expensive testing is on.

e.53.4.c: Add -DITESTITERS=20 to dg-options unless expensive testing is on.

	* testsuite/libgomp.c/examples-4/e.53.4.c: Add -DITESTITERS=20
	to dg-options unless expensive testing is on.
	(TESTITERS): Define to N if not defined.
	(main): Use TESTITERS instead of N.
	* testsuite/libgomp.c/examples-4/e.55.1.c: Define CHUNKSZ from
	dg-additional-options depending on whether expensive testing is on.
	* testsuite/libgomp.fortran/examples-4/e.55.1.f90 (e_55_1_mod):
	Decrease N to 100000 and CHUNKSZ to 10000.

From-SVN: r218095