Do not set WriteFlags::WRITE_MSG_ZEROCOPY if the buffer ! isManaged()
Do not set WriteFlags::WRITE_MSG_ZEROCOPY if the buffer ! isManaged()

Summary: Do not set WriteFlags::WRITE_MSG_ZEROCOPY if the buffer isShared()

Reviewed By: yfeldblum

Differential Revision: D6068711

fbshipit-source-id: fff14dcd4fcb20c9dbb60794420845042518922c

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