Remove superfluous write barriers
Remove superfluous write barriers

These are all handled by vtables.

parrot/parrot,FROGGS/parrot,parrot/parrot,youprofit/parrot,parrot/parrot,tkob/parrot,FROGGS/parrot,gitster/parrot,tkob/parrot,tkob/parrot,gitster/parrot,FROGGS/parrot,FROGGS/parrot,tkob/parrot,youprofit/parrot,tkob/parrot,FROGGS/parrot,youprofit/parrot,tkob/parrot,gitster/parrot,tkob/parrot,FROGGS/parrot,parrot/parrot,gitster/parrot,youprofit/parrot,youprofit/parrot,gitster/parrot,gitster/parrot,FROGGS/parrot,parrot/parrot,youprofit/parrot,FROGGS/parrot,youprofit/parrot,tkob/parrot,youprofit/parrot,gitster/parrot