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Fix tensor numel() return dtype

The original dytpe int would be an issue if the tensor element numbers are larger than int32's range (which is not a super large number in real workloads)
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* fix bug if all values<0
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* Compute amax in normalization kernels as long as the pointer is provided, even if using non quantized output
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* Fuse amax computation into normalization forward
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* Compute amax in activation kernels when the output pointer is provided, even for non-fp8 outputs
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