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Adds a patch to fix Megatron FSDP compatibility with PyTorch 2.10+. The patch updates get_mesh_names to use the new DeviceMesh API (_get_root_mesh() and _flatten_mapping) instead of the deprecated _mesh_resources.child_to_root_mapping removed in PyTorch 2.10. The patch is automatically applied when use_megatron_fsdp is enabled.