Introduce cuda_p2p based fused_all_gather_matmul and fused_matmul_reduce_scatter #126597
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…uce_scatter [ghstack-poisoned]
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/126597
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…uce_scatter ghstack-source-id: e2d8a4b7af63fa5097340bc0990fde5c62b3580a Pull Request resolved: pytorch#126597
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