RFR: JDK-8302666: Replace CHM with VarHandle in ForeachOrderedTask [v6]

[Paul Sandoz]

On Thu, 2 Mar 2023 11:22:26 GMT, Viktor Klang <duke at openjdk.org> wrote:

>> I noticed when looking at the code that there was no real need to use a CHM to perform the tracking of activation in an ordered fashion on ForEachOrderedTask, but instead a VarHandle can be used, reducing allocations and indirection.
>
> Viktor Klang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Removing unnecessary cast of argument to VarHandle getAndSet

Marked as reviewed by psandoz (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/12320