swift

7e0faeb2 - [AutoDiff] Simplify logic for checking unmet generic requirements. (#27783)

[AutoDiff] Simplify logic for checking unmet generic requirements. (#27783) The `SubstitutionMap` passed to `diagnoseUnsatisfiedRequirements` should default to the original function's forwarding substitution map. Delete the static `getSubstitutionMap` function, whose purpose is not clear and is not needed.