cp:
	PR c++/13387
	* class.c (finish_struct_1): Compute mode and alias set for
	CLASSTYPE_AS_BASE.
	* call.c (build_over_call): Use CLASSTYPE_AS_BASE for trivial
	assignment of a class, as necessary.
	* cp-lang.c (cxx_get_alias_set): The alias set as a base is the
	same as for the complete type.
testsuite:
	PR c++/13387
	* g++.dg/expr/assign1.C: New test.

From-SVN: r74683