RFR: 8299125: UnifiedOopRef in JFR leakprofiler should treat thread local oops correctly [v2]

[Markus Grönlund]

On Mon, 2 Jan 2023 08:38:12 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

>> In a similar vain to [JDK-8299089](https://bugs.openjdk.org/browse/JDK-8299089) there are different semantics for OopStorage and thread local oops. UnifiedOopRef in the jfr leakprofiler must be able to distinguish these and treat them appropriately.
>> 
>> Testing: Running test at the moment. Has been running on the generational branch of ZGC for over three months. Not many tests exercise the leakprofiler. x86_32 has mostly been tested with GHA. 
>> 
>> Note: The accessBackend changes are only there to facilitate comparing OopLoadProxy objects directly with nullptr instead of creating and comparing with an `oop()` / `oop(NULL)`. Can be backed out of this PR and put in a different RFE instead.
>
> Axel Boldt-Christmas has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Use more suitible nomenclature: raw

This is introducing some new, very complicated tagging scheme. I don't understand it. What is 0b011 ?

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PR: https://git.openjdk.org/jdk/pull/11741