RFR: 8261090: Store old classfiles in static CDS archive

[Jiangli Zhou]

On Wed, 14 Apr 2021 00:14:46 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

> Please review this RFE for storing old classfiles with major version < 50 in static CDS archive.
> During static CDS dump time, old classes won't be verified/rewritten. They will be verified/rewritten during runtime.
> Therefore, the `_constMethod`, `_constants`, and `_cache` of old classes must be stored in the RW region of the archive for runtime rewriting. The `ConstantPool::remove_unshareable_info` will be skipped during dump time and the `ConstantPool::restore_unshareable_info` will be skipped during runtime for old classes.
> 
> Passed tiers 1,2,3,4 tests on mach5.

Could you please provide performance numbers? It would be good to understand the performance benefits from archiving the old classes when verification and linking are deferred at runtime. Thanks.

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PR: https://git.openjdk.java.net/jdk/pull/3479