Revert "[AutoDiff] Forward-mode support for variables, generics, tuples, structs."#27250

dan-zheng wants to merge 1 commit intotensorflowswiftlang/swift:tensorflowfrom

revert-26743-differential-emitter-generic-supportswiftlang/swift:revert-26743-differential-emitter-generic-supportCopy head branch name to clipboard