Add two canonicalization pattern for AllReduce. #966
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``` 1. all-reduce(sharded-to-unreduced(x, axes), flattened_axes) = all-gather(x, axes) 2. all-reduce(replicated-to-unreduced(x, axes), axes) = x ``` This pattern is from the definition of the sharded-to-unreduced and replicated-to-unreduced. PiperOrigin-RevId: 861974180
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Add two canonicalization pattern for AllReduce.
This pattern is from the definition of the sharded-to-unreduced and replicated-to-unreduced.