use long index type for index_add_cuda deterministic path #59254
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Summary:
index_add can take int or long index tensor whereas index_put only takes long indices tensor.
In the deterministic path of index_add_cuda, we use index_put. Hence we better convert index tensor to long.
Test Plan:
buck test mode/opt //caffe2/test:torch_cuda -- test_index_add_deterministic
Differential Revision: D28804038