524d4cd8d1
map-ir-children single-sourced the child layout for rewrite passes; the read-only analyses each re-enumerated ops by hand. Add a fold companion, reduce-ir-children, and rebuild body-size, pure?, and body-closed? on it (each reduces to a leaf value + the special ops it actually needs). local-escapes? stays an explicit walk — its default is conservatively true and it inspects node shape beyond child purity, so folding an unhandled op over its children would be unsound for scalar replacement. |
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