RFR: 8291733: Remove JFR events that expose hashtable

[Erik Gahlin]

On Tue, 2 Aug 2022 16:42:44 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> There are JFR events for the Placeholders table, LoaderConstraintTable and ProtectionDomainCacheTable. These events expose implementation details for these tables that we'd rather not expose. A users visibility into these tables will not be helpful and it restricts our ability to make these a different (smaller) table or in the case of ProtectionDomain, not a table at all.
> 
> The Dictionary table (table of loaded classes) is useful from a users' perspective because it can be resized and we wanted to have events for the resizing. These other tables came along in that change.
> 
> Tested with tier1-3.

Marked as reviewed by egahlin (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/9714