IL: add ILPreNamespace, make ILPreTypeDef creation lazy - #20092

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auduchinok:il-pre-namespace

Commits on Jul 30, 2026

IL: add ILPreNamespace, make ILPreTypeDef creation lazy
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IL: shrink per-ILTypeDefs namespace overhead

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IL: simplify namespace grouping, restore metadata order when flattening

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IL: restore the TypeDef order where it is needed, not in ILTypeDefs

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WIP: shared namespace-level machinery, import over it, benchmarks

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Don't force namespace contents when building the initial TcEnv

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Add end-to-end tests for what checking a file reads out of a reference

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Release notes
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