RFR: 8292375: Convert ProtectionDomainCacheTable to ResourceHashtable [v3]

[David Holmes]

On Tue, 30 Aug 2022 18:13:21 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> compute_hash() is always called on a live WeakHandle so will never return null.
>
> I think you should add an assert that the `protection_domain.resolve()` never returns null, with a comment explaining why.

I agree. In general if code is using WeakHandle's then I would expect to see null checks.

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PR: https://git.openjdk.org/jdk/pull/10043