[Mosaic TPU] Fold sublane offset to indices when storing to untiled ref. #24919
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This optimization avoids unnecessary retiling when storing to untiled ref but adds at most one extra store op for sublane offset (since sublane offset is limieted to < VregSlice[0]). PiperOrigin-RevId: 698896373
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[Mosaic TPU] Fold sublane offset to indices when storing to untiled ref.
This optimization avoids unnecessary retiling when storing to untiled ref but adds at most one extra store op for sublane offset (since sublane offset is limieted to < VregSlice[0]).