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24445dd2e2
Generate SIL differentiability witnesses from `@differentiable` and `@derivative` declaration attributes. Add SILGen utilities for: - Emiting differentiability witnesses. - Creating derivative function thunks, which are used as entries in differentiability witnesses. When users register a custom derivative function, it is necessary to create a thunk with the expected derivative type computed from the original function's type. This is important for consistent typing and consistent differentiability witness entry mangling. See `SILGenModule::getOrCreateCustomDerivativeThunk` documentation for details. Resolves TF-1138.