C#: Cleanup expanded assignments.#21452

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michaelnebel:csharp/expandedassignment

Commits on Mar 11, 2026

C#: Extract compound operator assignments as is.
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Commits on Mar 12, 2026

C#: Update the DB Scheme such that compound assignments can be considered operator calls.
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C#: Let assign operations be operator calls.
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C#: Add another group of assignable definitions (corresponding to compound assignment operations) and update taint flow for +.
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Commits on Mar 13, 2026