8352394: [CRaC] AOT class linking cannot archive jdk.internal.crac.Core$Priority

[TimPushkin]

Fixes (or rather works around) the incompatibility with AOT class linking by converting jdk.internal.crac.Core$Priority into a usual class. We can convert it back to enum when CDS either starts supporting archiving Reference objects or stops aborting the archiving when it stumbles upon an unsupported object.

An alternative approach would be to make CDS treat this particular enum class specially and don't archive it in initialized state but messing with CDS internals can lead to many conflicts later.

This is a draft because after implementing I noticed JDK-8344140 which restricted the set of AOT-initialized enums — maybe jdk.internal.crac.Core$Priority is not in the restricted set. We should get JDK-8344140 integrated as part of jdk 25+6 and see if the issue resolves itself.

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Progress

• [x] Change must not contain extraneous whitespace

Issue

• JDK-8352394: [CRaC] AOT class linking cannot archive jdk.internal.crac.Core$Priority (Bug - P4)

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[TimPushkin]

Still relevant, at least until 25+6 is merged

[TimPushkin]

After 25+6 has been merged all of the problematic tests now pass so this change is no longer needed