trunk/4f5df3355d816f0e00cfb179f1817a9130d7bb2f: [native-aot] Support unstructured functional operators (#197012)

发生了什么

Human Notes: Allow non-structured ops to have AOT implementations -- notably for ops like RMSNorm. Simple extension to the current AOT code. Prep for RMSNorm and some reductions AOT Codex: Native AOT currently assumes structured meta/impl wrappers, so functional operators without a structured delegate cannot embed kernels. Add an explicit STRUCTURED=False declaration and a boolean stub with a trailing result referen…

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