Fix PR c++/48574

gcc/cp/

	PR c++/48574
	* class.c (fixed_type_or_null): Use type_dependent_p_push to test
	if the instance has a dependent initializer.

gcc/testsuite/

	PR c++/48574
	* g++.dg/template/dependent-expr8.C: New test case.

From-SVN: r173570