RFR: JDK-8303742: CompletableFuture.orTimeout leaks if the future completes exceptionally [v6]

[Viktor Klang]

On Fri, 17 Mar 2023 09:52:51 GMT, Viktor Klang <duke at openjdk.org> wrote:

>> Addresses the situation where exceptional completion of `orTimeout`:ed CompletableFutures wouldn't cancel the timeout task which could lead to memory leaks if done frequently enough with long enough timeout durations.
>> 
>> Fix discussed with @DougLea
>
> Viktor Klang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Reformatting the while-body to be more legible in diffs, and inlining the counter incrementation.

I just synced up with @DougLea—I'll let him decide how to handle it. :)

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PR: https://git.openjdk.org/jdk/pull/13059