Fix PR c++/66857

gcc/cp/ChangeLog:

	PR c++/66857
	* cvt.c (ocp_convert): Don't call scalar_constant_value when
	converting to a class type.

gcc/testsuite/ChangeLog:

	PR c++/66857
	* g++.dg/init/pr66857.C: New test.

From-SVN: r226228