[master] Withdrawn: Only include Mark Word when required

[duke]

On Mon, 25 Apr 2022 04:57:19 GMT, Julian Waters <jwaters at openjdk.org> wrote:

> WIP, some code here is meant as a placeholder
> 
> Discussion: https://bugs.openjdk.java.net/browse/JDK-8198331
> 
> Current goals and dependencies (To help keep track)
> - [x] 2 bit identity Hash Code
> - [ ] Elimination of locking from the Mark Word entirely (Hopefully)
> - [ ] 5 bit GC section (4 bit object age, 1 bit forwarding state)
> - [ ] No Mark Word in header until required
> - [ ] Support and optimizations for objects guaranteed to not have a Mark Word (May depend on Valhalla for the GC section)

This pull request has been closed without being integrated.

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PR: https://git.openjdk.org/lilliput/pull/47