[ExecuTorch][WebGPU] SymInt live-scalar mechanism + et_vk.select_as_symint#20206
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…ymint Pull Request resolved: #20085 Adds the dynamic-scalar (SymInt) mechanism to the WebGPU graph as a standalone enabler, ahead of the SDPA op that consumes it. Mirrors the Vulkan delegate's SymInt = live uniform-buffer design: a `ValueType::SymInt` backed by a 16-byte `Uniform|CopyDst` buffer, `set_symint`/`read_symint`/`symint_buffer` accessors with dirty-tracking, a `SymIntSource` + `add_symint_source`/`update_symints_from_inputs` host-read path, and an `add_resize_hook`/`propagate_resize`/`dispatch_at` recompute plumbing. `WebGPUBackend::execute` calls `propagate_resize` after refreshing the SymInts from the runtime inputs. The `et_vk.select_as_symint` op handler records `out SymInt = x[index]` along a dim at build time. This diff has no in-graph consumer yet — the SDPA op (stacked above) reads the SymInt value via `read_symint()` for dynamic `input_pos`. Building it as its own diff keeps the enabler separate from the op, matching the update_cache → mechanism → SDPA layering. Authored with assistance from Claude. ghstack-source-id: 391979584 @exported-using-ghexport Differential Revision: [D107584280](https://our.internmc.facebook.com/intern/diff/D107584280/)
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20206
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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: #20085 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/18/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/JulianCloudNTH/18/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/JulianCloudNTH/17/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/JulianCloudNTH/18/orig
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