Followup patch, realizing that we do not need two interfaces for
replacement of rollback place. Only replace_rollback_place_for_value()
is needed, and we also see that the "value" is always the contents of
the "place".

- THD::replace_rollback_place_for_ref() is removed.

- THD::replace_rollback_place_for_value() is renamed to
  replace_rollback_place(), since the specialization is no longer needed.

- First argument is removed, value is instead taken from the contents
  of "new_place".