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[Mosaic GPU] Implement meet and join for replicated layouts. #29952

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[Mosaic GPU] Implement meet and join for replicated layouts.

We no longer assume that two layouts within a {Least,Most}ReplicatedExpression
are always compatible, and now make sure to reduce all the layout expressions
within the replicated expression before deciding whether a least/most
replicated expression even exists.

This is the correct behaviour to have for equations. The logic implemented
previously is appropriate for Hints, and will be added to the layout
inference in an upcoming change.

We no longer assume that two layouts within a `{Least,Most}ReplicatedExpression`
are always compatible, and now make sure to reduce all the layout expressions
within the replicated expression before deciding whether a least/most
replicated expression even exists.

This is the correct behaviour to have for equations. The logic implemented
previously is appropriate for `Hint`s, and will be added to the layout
inference in an upcoming change.

PiperOrigin-RevId: 778497953
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