trunk/c96c0d945cc30cd4317ca02911049a75e43972b7: flex_gemm: separate layout recognition from reduction analysis (#198421)

发生了什么

AI-assisted summary of the author-requested refactor-only base: Move grouped-view recognition and main-output contraction matching into gemm_epilogue_layout.py . Keep reduction dataflow and output ownership in gemm_epilogue_analysis.py ; codegen and the existing layout tests import recognition from its canonical owner. This is a behavior-preserving refactor. Existing recognition bodies, supported expressions, guards…

摘要按规则整理自下方来源原文

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