8334772: Change Class::protectionDomain and signers to explicit fields

[liach]

Please review this change that moves Class.protectionDomain and signers to explicit fields.

Related native methods in Class and AccessController::getProtectionDomain are converted to pure Java. These fields are still set and used by hotspot. Also fixes the incorrect protectiondomain_signature in vmSymbols, which is actually an array descriptor.

Note that these new fields are not filtered: filtering in early bootstrap requires other unrelated adjustments as we can't even use hashCode on String, and filtering is not proper encapsulation either.

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Issue

• JDK-8334772: Change Class::protectionDomain and signers to explicit fields (Enhancement - P4)

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[openjdk]

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[mlbridge]

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• 00: Full (72758477)

[AlanBateman]

I don't think we should expose this outside of java.lang.

[AlanBateman]

Offline discussion with Chen and I think the advice is to drop all the changes for ProtectionDomain for now. This area will change significantly as part of the SecurityManager removal work.

[liach]

The migration of signers will be in a new PR. This patch will be kept so people will know the extra test updates related to migration of protectionDomain.