[XLA] Add HloSharding reconstruction utils#42576
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This change adds utilities to factor manual sharding and reconstruct literals from shards, supporting Named Sharding (V3) and Manual Subgroups (V2). - Adds FactorManualSharding to group shards by manual axes. - Adds UnshardLiteral to reconstruct global literals. - Optimizes manual subgroup processing by caching tile indices. - Includes unit tests for various sharding configurations, including edge cases like padded tiles. PiperOrigin-RevId: 915521131
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[XLA] Add HloSharding reconstruction utils
This change adds utilities to factor manual sharding and reconstruct literals from shards, supporting Named Sharding (V3) and Manual Subgroups (V2).