RFR: 8319123: Implement JEP 461: Stream Gatherers (Preview) [v8]

[Viktor Klang]

On Tue, 14 Nov 2023 16:35:53 GMT, Viktor Klang <vklang at openjdk.org> wrote:

>> This Pull-Request implements [JEP-461](https://openjdk.org/jeps/461)
>
> Viktor Klang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Unpacking the rethrown exceptions from Gatherers.mapConcurrent()

src/java.base/share/classes/java/util/stream/Gatherers.java line 388:

> 386:             }
> 387: 
> 388:             final boolean flush(long atLeastN,

@AlanBateman @PaulSandoz Was alerted to odd nesting of exceptions so I reworked the exception handling of mapConcurrent to unpack any ExecutionException, and intercept InterruptedExceptions to cancel remaining work and reinstating the interrupted flag.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16420#discussion_r1392900033