portable: accumulate in fp32 for Half/BFloat16 in softmax, log_softmax, mean, and sum #20090

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vacu9708 wants to merge 2 commits into pytorch:main from vacu9708:fp32-accumulation-bfloat16

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portable: accumulate in fp32 for Half/BFloat16 in softmax, log_softmax, mean, and sum #20090

portable: accumulate in fp32 for Half/BFloat16 in mean and sum

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