RFR: 8292375: Convert ProtectionDomainCacheTable to ResourceHashtable [v7]

[David Holmes]

On Thu, 1 Sep 2022 07:12:25 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> I am utterly confused about why we need ProtectionDomainCacheTable at all.

It tracks whether we have seen this PD before so that `validate_protection_domain` can skip the Java upcall to `checkPackageAccess`.

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