Richard Wei f79391b684 [AutoDiff] Remove 'differentiableFunction(from:)' and 'linearFunction(from:)'. ...

Remove unused APIs `differentiableFunction(from:)` and `linearFunction(from:)`. They were never official APIs, are not included in the [initial proposal](https://github.com/rxwei/swift-evolution/blob/autodiff/proposals/0000-differentiable-programming.md#make-a-function-differentiable-using-derivative), and are unused by existing supported client libraries (SwiftFusion and S4TF). Most importantly, they block crucial optimizations on linear map closures (#34935) and would need nontrivial work in SILGen to support.

2021-01-12 11:58:48 -08:00

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