objc-act.c (objc_add_static_instance): Set DECL_INITIAL and DECL_DEFER_OUTPUT on the decl we create...

	* objc/objc-act.c (objc_add_static_instance): Set DECL_INITIAL
	and DECL_DEFER_OUTPUT on the decl we create, before calling
	rest_of_decl_compilation.
testsuite:
        * objc/execute/string1.m, objc/execute/string2.m: Compare the
        result of -cString against what we expect it to be; don't just
        print it out for no one to read.

	* objc/execute/string3.m, objc/execute/string4.m: New tests.
	Based on testcases provided by Nicola Pero.

From-SVN: r40261