Test gcc features used by ECOS.

Test gcc features used by ECOS.

	* gcc.dg/special/ecos.exp: New test driver for new tests with
	special requirements.
	* gcc.dg/special/alias-1.c: New test.
	* gcc.dg/special/gcsec-1.c: New test.
	* gcc.dg/special/weak-1.c: New test.
	* gcc.dg/special/weak-1a.c: Accompanying file to weak-1.c.
	* gcc.dg/special/weak-2.c: New test.
	* gcc.dg/special/weak-2a.c: Accompanying file to weak-2.c.
	* gcc.dg/special/weak-2b.c: Accompanying file to weak-2.c.
	* gcc.dg/special/wkali-1.c: New test.
	* gcc.dg/special/wkali-2.c: New test.
	* gcc.dg/special/wkali-2a.c: Accompanying file to wkali-2.c.
	* gcc.dg/special/wkali-2b.c: Accompanying file to wkali-2.c.

From-SVN: r25139