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Fix heap buffer overflow in UnsortedSegmentSum.
When Index=int32, data_size and num_segments were truncated from int64 to int32. This truncation can produce negative numbers, which causes UnsortedSegmentFunctor to access out of bounds memory. Also: - Switches some indexing calculations to int64 to avoid signed integer overflow when either the input or output tensors have more than 2**31 - 1 elements. - Fixes a range check error in the GPU kernel. The segment ID was checked against an upper bound measured in elements, not segments. PiperOrigin-RevId: 256451663
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