Add rely_stutter_ok proof
Add rely_stutter_ok proof

Capture the idea that if {C pre C} p is proven, then it must be safe to
include identity transitions.

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