I wrote:
> I wonder if condvars on OSX has a "memory" of which mutexes
> are associated with it.  If so, that would be a problem with
> the rewritten GVL.  So maybe a second condvar is necessary
> in native_thread_data.

Maybe using separate condvar in r64124 will help.
(Maybe reverting r64123 helps, too)

Otherwise, maybe skip rb_native_cond_destroy
in native_thread_destroy but I don't think that
is the problem, here...

I need to go away for a few hours :<

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