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Anton Korobeynikov
ca483d0fa0
This effectively allows us to register single derivative for a multiple original functions: protocol requirement and (possibly) default implementations from extensions. As a result, we might have default derivatives registered for protocol requirements and non-differentiable requirements conditionally differentiable (in an extension). Roll back test changes from #84800 and re-enable `SIMD` and `Tracked<T>` differentiability by providing default derivatives for `AdditiveArithmetic` and `Numeric`. Fixes #55611 Fixes #84840 Fixes #87705 Fixes #87693