better lg_lgd_match (but unused for now; need it for recovery reasoning) partial proof of pd_forward_sim
better lg_lgd_match (but unused for now; need it for recovery reasoning)
partial proof of pd_forward_sim

mit-pdos/fscq-impl,mit-pdos/fscq-impl,mit-pdos/fscq-impl,mit-pdos/fscq-impl,mit-pdos/fscq-impl