swift

7498390f - [AutoDiff] Add build-script flag for differentiable programming. (#27596)

[AutoDiff] Add build-script flag for differentiable programming. (#27596) Add `--enable-experimental-differentiable-programming` build-script flag. The build-script flag enables/disables standard library additions related to differentiable programming. This will allow official Swift releases to disable these additions. The build-script flag is on by default to ensure testing of differentiable programming standard library additions. An additional driver flag must be enabled to use differentiable programming features: https://github.com/apple/swift/pull/27446 Mirror of https://github.com/apple/swift/pull/27595, with minor changes specific to tensorflow branch.