RFR: 8295964: Move InstanceKlass::_misc_flags

[David Holmes]

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.

Refactoring looks good. These are all the immutable flags right? (ie set once during class creation, and no concurrency issues).

One query on SA below.

Thanks.

src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/oops/InstanceKlass.java line 129:

> 127: 
> 128:     MISC_REWRITTEN                    = db.lookupIntConstant("InstanceKlass::_misc_rewritten").intValue();
> 129:     MISC_HAS_NONSTATIC_FIELDS         = db.lookupIntConstant("InstanceKlass::_misc_has_nonstatic_fields").intValue();

These all seem to have been deleted rather than modified ??

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Marked as reviewed by dholmes (Reviewer).

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