RFR: 8306474: Move InstanceKlass read-only flags [v2]

[David Holmes]

On Thu, 20 Apr 2023 00:27:20 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Moved three read-only InstanceKlass flags out of AccessFlags to InstanceKlassFlags, and removed unused and unneeded SA code.
>> Tested with tier1-4.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   John's suggestion

Changes seem fine. Thanks.

Why was `has_finalizer` not included with this group?

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Marked as reviewed by dholmes (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13545#pullrequestreview-1393091073