[pmap] Update jax_utils.unreplicate for performant use when jax.config.jax_pmap_shmap_merge is True.
#5153
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…nfig.jax_pmap_shmap_merge` is `True`. For more details, see https://docs.jax.dev/en/latest/migrate_pmap.html#int-indexing-into-sharded-arrays PiperOrigin-RevId: 845027363
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[pmap] Update
jax_utils.unreplicatefor performant use whenjax.config.jax_pmap_shmap_mergeisTrue.For more details, see https://docs.jax.dev/en/latest/migrate_pmap.html#int-indexing-into-sharded-arrays