RFD: Replace class java.lang.Shutdown.Lock with Object?

[Eirik Bjørsnøs]

Hi,

java.lang.Shutdown uses a static nested Lock class for synchronization.
This seems trivially replaceable with new Object() which would reduce class
loading during shutdown.

java.lang.ref.ReferenceQueue uses a similar idiom and could potentially be
cleaned up as well.

I'd be happy to contribute a PR for this cleanup. Worth pursuing? Thoughts?

Cheers,
Eirik.
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