ciflow/inductor/200700: [inductor] Run very large short reductions outside combo kernels

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Summary: The combo kernel partitioner already gives a reduction its own kernel when numel * rnumel exceeds LARGE_NUMELS , but only for long reductions (rnumel > 2048). A large short reduction still shares a combo kernel with small ones and inherits their config. For an all-persistent combo, select_combo_heuristics takes the configs of the sub-kernel with the largest rnumel, which is usually a small one. In a product…

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