* lib/gcc-dg.exp: Set up TORTURE_OPTIONS, torture_with_loops,
	and torture_without_loops as is done by c-torture.exp.
	(search_for): Copy from c-torture.exp.
	(gcc-dg-runtest): New function, drives a directory of tests
	iterating over the TORTURE_OPTIONS.
	(scan-assembler, scan-assembler-not): Move here from
	individual directory drivers.

	* gcc.dg/dg.exp: scan-assembler, scan-assembler-not now
	defined by lib/gcc-dg.exp.
	* gcc.dg/cpp/cpp.exp: Likewise.
	* gcc.dg/noncompile/noncompile.exp: Likewise.  Use
	gcc-dg-runtest, so we cycle over optimization options.

	* gcc.dg/cpp/20000625-2.c: Expect warning on line 8, not 9.
	* gcc.dg/compare2.c: No longer expected to fail.

From-SVN: r35500