There may be cases in which a user wants to know which part of their code is unstable.
We use ObservedFuncs and UnstableCounters to print at exit which of the ObservedFunctions
are unstable under the -print_unstable_stats flag.
Patch by Kyungtak Woo (@kevinwkt).
Let's re-phrase a bit, maybe: "If 1, at exit print functions that have unstable coverage edges. Requires -handle_unstable!=0"
Still sounds bad to me though, hopefully Jonathan can help :)