c++: Adjust array type construction

c++: Adjust array type construction

This restores the dependent array changes I reverted, now that pr98116
appears fixed.  As mentioned before, when deserializing a module we
need to construct arrays without using the dependent-type predicates
themselves.

	gcc/cp/
	* cp-tree.h (build_cplus_array_type): Add defaulted DEP parm.
	* tree.c (set_array_type_common): Add DEP parm.
	(build_cplus_array_type): Add DEP parm, determine dependency if
	needed.  Mark dependency of new types.
	(cp_build_qualified_type_real): Adjust array-building call, assert
	no surprising dependency.
	(strip_typedefs): Likewise.