[XLA:SPMD] Fix ReshapeSharding for dimensions of size 1 and >1 partitions. #17787
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[XLA:SPMD] Fix ReshapeSharding for dimensions of size 1 and >1 partitions.
If there is a source dimension satisfying the following conditions, we replicate the source sharding along this dimension since the source sharding cannot be propagated along this dimension.
An example is shown below. Please refer to the added examples in hlo_sharding_util_test.cc.