Function unreachable_prepare_func

pub(crate) fn unreachable_prepare_func<VM: VMBinding>(
    _mutator: &mut Mutator<VM>,
    _tls: VMWorkerThread,
)

A place-holder implementation for MutatorConfig::prepare_func that should not be called. It is the most often used by plans that sets PlanConstraints::needs_prepare_mutator to false. It is also used by NoGC because it must not trigger GC.