Build the shape reducer once rather than many times - #1487
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lookup_shape instantiated Shape_reduce.Make on every call, discarding its memo tables each time. The reducer depends only on the resolver's lookup_impl, so construct it alongside the resolver (new Shape_reducer module) and carry it in Env.resolver; lookups within a link then share memoized work. Roughly halves peak link memory on core's worst units, and resolves more source locations since repeated queries share state. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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We can share its caches as a result, which massively reduces allocation.