[Bug c++/89224] [11/12/13/14 Regression] subscript of const vector has the wrong type

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89224

--- Comment #12 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>-      type = build_qualified_type (TREE_TYPE (type), TYPE_QUALS (type));

That part is missing it seems.
Let me see if I can fix this.