[crac] RFR: Improved open file descriptors tracking [v2]

[Radim Vansa]

On Tue, 31 Jan 2023 17:11:24 GMT, Radim Vansa <duke at openjdk.org> wrote:

>> Tracks `java.io.FileDescriptor` instances as CRaC resource; before checkpoint these are reported and if not allow-listed (e.g. as opened as standard descriptors) an exception is thrown. Further investigation can use system property `jdk.crac.collect-fd-stacktraces=true` to record origin of those file descriptors.
>> File descriptors claimed in Java code are passed to native; native code checks all open file descriptors and reports error if there's an unexpected FD that is not included in the list passed previously.
>
> Radim Vansa has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Drop native FDs tracking

@AntonKozlov I've dropped the native FDs tracking.

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PR: https://git.openjdk.org/crac/pull/43