RFR: JDK-8302666: Replace CHM with VarHandle in ForeachOrderedTask [v2]

[Paul Sandoz]

On Fri, 17 Feb 2023 11:39:21 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:
> 
>   Write the initial value of the next reference without using the VarHandle

That's a nice find, looks good. (Update the year in the copyright header.)

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Marked as reviewed by psandoz (Reviewer).

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