RFR: 8295964: Move InstanceKlass::_misc_flags

[Coleen Phillimore]

On Tue, 13 Sep 2022 13:29:45 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> I moved misc_flags out to their own misc flags class so that we can put the writeable accessFlags there too with atomic access.
> 
> Tested with tier1-4.

Thank you for the code reviews, David and Serguei.

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PR: https://git.openjdk.org/jdk/pull/10249