[pmap] Cache computing effective mesh devices. #34522
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Clean up / combine logic for computing global axis size / mesh devices. Improving the `jax.jit(jax.shard_map)` implementation of `jax.pmap`. PiperOrigin-RevId: 861852483
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[pmap] Cache computing effective mesh devices.
Clean up / combine logic for computing global axis size / mesh devices.
Improving the
jax.jit(jax.shard_map)implementation ofjax.pmap.