swift

610aee04 - [AutoDiff] Unify forward- and reverse-mode activity analysis. (#27358)

[AutoDiff] Unify forward- and reverse-mode activity analysis. (#27358) - Unify handling of `apply` direct results. - Create `forEachApplyDirectResult` helper for iterating over `apply` direct results, with special logic for handling `destructure_tuple` users. This replaces `collectAllExtractedElements`, which required inefficient allocation. - Remove `collectAllActualResultsInTypeOrder` "indirect results" argument, which always comes from the `ApplyInst` argument. - Unify forward- and reverse-mode activity analysis. - Remove `AutoDiffAssociatedFunctionKind` from `DifferentiableActivityInfo`. - TF-813: verify that enabling forward-mode does not affect reverse-mode. - Miscellaneous gardening. Resolves TF-800 and TF-813. The remaining differences between forward- and reverse-mode are expected.