RFR: 8306123: Move InstanceKlass writeable flags

[Ioi Lam]

On Tue, 18 Apr 2023 17:11:25 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> Please review this patch to move the writeable Klass AccessFlags to InstanceKlassFlags.
> Tested with tier1-4.

LGTM.

-------------

Marked as reviewed by iklam (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/13515#pullrequestreview-1390984891