RFR: 8266891: Provide a switch to force the class space to a specific location [v2]

[Coleen Phillimore]

On Tue, 8 Jun 2021 13:08:40 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> To test compressed Klass pointer encoding and other metaspace interna, it would be nice to be able to force location of the class space to a specific location. This would help with analysis of problems like JDK-8261552 or JDK-8265705 - errors in Klass* encoding/decoding which managed to stay unnoticed for an astonishingly long time.
>> 
>> For simplicity, it would be sufficient to only have this ability if CDS is disabled (Xshare=off), since CCS allocation is tied to CDS location otherwise and that would be more diffictult to disentangle.
>
> Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Feedback Coleen

This update looks good.  Could you do a paranoid short test run (or have you done?) before integrating?  Thanks!
Never mind, I see the git build actions were successful.

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Marked as reviewed by coleenp (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/3969