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451227cb - [Bugfix][Kernel] Fix integer overflow in libtorch_stable/activation_kernels.cu (#49660)

[Bugfix][Kernel] Fix integer overflow in libtorch_stable/activation_kernels.cu (#49660) Signed-off-by: molly-ting <molly.cn.mail@gmail.com> Co-authored-by: Michael Goin <mgoin64@gmail.com>