PR c++/6392
        * cp/tree.c (build_cplus_array_type): Handle all quals the same.
        (cp_build_qualified_type_real): Look through arrays first.
        * c-common.c (c_build_qualified_type): Look through arrays first.
        (c_apply_type_quals_to_decl): Look through arrays.

        * c-common.c (c_apply_type_quals_to_decl): Unset TREE_READONLY for
        types with constructors.

From-SVN: r72259