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gh-149400: Expose `Barrier` in `multiprocessing.synchronize.all` #264300

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gh-149400: Expose `Barrier` in `multiprocessing.synchronize.all`

gh-149400: Expose `Barrier` in `multiprocessing.synchronize.all` #264300

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Job	Run time
DO-NOT-MERGE	3s
Unresolved review	4s
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