[lilliput-jdk21u:lilliput] RFR: 8316108: [Lilliput/JDK21] Cherry-pick: 8305898: Alternative self-forwarding mechanism

[Aleksey Shipilev]

On Tue, 12 Sep 2023 11:15:28 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> Let's cherry-pick the current state of the upstream PR https://github.com/openjdk/jdk/pull/13779. It applies cleanly on top of lilliput/jdk21u.
> 
> Testing:
>  - [ ] hotspot_gc (+UseAltGCForwarding)
>  - [ ] hotspot_gc (-UseAltGCForwarding)

Looks okay.

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Marked as reviewed by shade (Reviewer).

PR Review: https://git.openjdk.org/lilliput-jdk21u/pull/4#pullrequestreview-1622037095