[TF:XLA] Change ArCrsCombiner to use division instead of subtraction. This way,
when we move the AR down the graph, the adjustment stays before the AR, not after, and the AR moves closer to the CRS. Then, it's easier to move the AR past multiple ops one-at-a-time in future CLs. Also, some bug fixes in InstructionsComputeSameValue. PiperOrigin-RevId: 224592476
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