[ExecuTorch][WebGPU] Per-pass compute dispatch ordering for fused multi-dispatch ops#20162
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…ti-dispatch ops Pull Request resolved: #20072 WebGPU has no write->read ordering between dispatches in a single compute pass, so a fused multi-dispatch op (SDPA) can read stale writes. Record one compute pass per dispatch in `execute()` (both the full and ranged paths) -- the pass boundary is WebGPU's implicit barrier (there is no `vkCmdPipelineBarrier`). Single-dispatch ops are unchanged. Also flips this file to the C++17 nested namespace. Consumed by the fused SDPA op above. ghstack-source-id: 391378799 @exported-using-ghexport Differential Revision: [D107543258](https://our.internmc.facebook.com/intern/diff/D107543258/)
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20162
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This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #20072 by @JulianCloudNTH
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/JulianCloudNTH/12/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/JulianCloudNTH/12/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/main
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/JulianCloudNTH/12/orig
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