RFR: 8318682: SA decoding of scalar replaced objects is broken [v6]

[Chris Plummer]

On Wed, 17 Jan 2024 19:52:32 GMT, Tom Rodriguez <never at openjdk.org> wrote:

>> The changes for JDK-8287061 didn't update the SA decoding logic and there are other places where the decoding has gotten out of sync with HotSpot.  Some of them can't be tested because they are part of JVMCI but I've added a directed test for the JDK-8287061 code and a more brute force test that tries to decode everything.
>
> Tom Rodriguez has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Review comments

Marked as reviewed by cjplummer (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/17407#pullrequestreview-1828194783