trunk/2d30e766625fb4595c1ec1c626e7691bea459e9a: [Stable-ABI] Add torch::stable::mm_out and bmm_out. (#197441)

发生了什么

Adds torch::stable::mm_out and torch::stable::bmm_out to the stable ABI via the dispatcher path. Fixes #196927 and needed for torchvision stable-ABI, which currently carries a local mm_out helper . Summary Introduces torch::stable::mm_out(out, self, mat2) and torch::stable::bmm_out(out, self, mat2) in the existing 2.10 block of ops.h , mirroring torch::stable::sum_out . Adds my_mm_out /my_bmm_out and my_mm_out_dtype…

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