Add couple more write_barriers when we poke into DispatcherSub directly.
Add couple more write_barriers when we poke into DispatcherSub directly.

cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp