Performance of invalidating unused SwitchPoint

[Charles Oliver Nutter]

Hello all!

I can accept that invalidating a SwitchPoint that's in use would cause
some perf impact. But I'm wondering why we'd see the same perf hit for
invalidating a SwitchPoint that has never been bound. Is there a
reason for this?

I have a few places in JRuby where I eventually give up on caching
certain values if they fail too many times, but on the value updating
side I'm still invalidating SwitchPoints. If they're never actually
used other than to invalidate, shouldn't invalidating be cheap?

- Charlie