swift

1e4552c5 - [AutoDiff] NFC: Change `DifferentiableFunctionExtractee` to a top-level type. (#27688)

[AutoDiff] NFC: Change `DifferentiableFunctionExtractee` to a top-level type. (#27688) Many places in the compiler that are completely unrelated to `DifferentiableFunctionExtractInst` are using `DifferentiableFunctionExtractInst::Extractee`, including `@differentiable` type lowering (IRGen/GenDiffFunc.cpp). This patch refactors it and renames it to `NormalDifferentiableFunctionTypeComponent` so that it is no longer part of `DifferentiableFunctionInst`. Resolves [TF-904](https://bugs.swift.org/browse/TF-904).