viable/strict/1788342684: Keep saved-activation strides symbolic under dynamic shapes (#194420)

发生了什么

Problem Inductor can give a saved activation a different layout than the backward graph's placeholder carries (layout optimization, comprehensive padding), so AOTAutograd restrides the placeholder to match what the forward will produce. Inductor reports those strides as sympy expressions, but set_tracing_context_output_strides collapsed them with evaluate_symexpr , substituting the current hints. The resulting const…

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