gcc/testsuite:

	Based on the CFString implementation in FSF apple/trunk branch.

	* gcc.dg/darwin-cfstring-1.c: New.
	* gcc.dg/darwin-cfstring-2.c: New.
	* gcc.dg/torture/darwin-cfstring-3.c: New.
	* g++.dg/other/darwin-cfstring1.C: New.
	* g++.dg/torture/darwin-cfstring-3.C: New.

From-SVN: r165889