Delete hh_allow_hashtable_writes_by_current_process from hh_shared.c
Delete hh_allow_hashtable_writes_by_current_process from hh_shared.c

Summary: itsdeadjim

Reviewed By: samwgoldman

Differential Revision: D18983802

fbshipit-source-id: c13bd75a50eb4901c5be5b1a45d75260e00a3e2c

nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow