Guard jar_entry against potential use-after-frees.
Guard jar_entry against potential use-after-frees.

Summary: Deletes the copy ctor and adds a move ctor to protect `jar_entry` against potential use-after-free/double-free issues.

Reviewed By: agampe

Differential Revision: D33342449

fbshipit-source-id: da93195e303b8e07622d77d994e663e078d5577d

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex