viable/strict/1789770346: [inductor] Optimize full slice_scatter chains (#195631)

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The following summary was prepared with assistance from Codex and reviewed by the author. Rewrite slice_scatter chains that fill an entire tensor into peak memory efficient cat or copy_. Functionalizing chunking results in a chain of slice_scatter nodes, holding full-sized intermediate by the end of the chain. The main goal of this pass is to make the "chunking" region the most peak memory efficient, as this is the…

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