swift234

rework base object computation and application to apply data members
to to @lvalue bases instead of @inout bases, and make the verifier
check that the right type is being used consistently.

Before:

            (member_ref_expr type='@lvalue (E0, E1)' ...
               (address_of_expr implicit type='@inout ZipGenerator2<E0, E1>'
                 (declref_expr implicit type='@lvalue ZipGenerator2<E0, E1>'

After:

                  (member_ref_expr type='@lvalue (E0, E1)' ...
                    (declref_expr implicit type='@lvalue ZipGenerator2<E0, E1>' 



Swift SVN r11792