Remove AtomicReferenceMapBackend and CheapLockable #1018
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* Both classes are internal. * It's quite complicated and not really used anymore, except on TruffleRuby <= 21.1 which is very old. We can use SynchronizedMapBackend there instead. * It's the only user of CheapLockable and that looks quite unsafe, for example #cheap_wait does not account for spurious wakeups.
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except on TruffleRuby <= 21.1 which is very old.
We can use SynchronizedMapBackend there instead.
for example #cheap_wait does not account for spurious wakeups.