swift

89078cc6 - [AutoDiff] Add tests. (#28150)

[AutoDiff] Add tests. (#28150) Add the following: - Crasher tests. - Activity analysis tests. - Control flow differentiation known incorrect derivative tests. Crasher tests are in `test/AutoDiff/compiler_crashers`. They each reference a JIRA issue and start with `RUN: not --crash`. They should be moved to `test/AutoDiff/compiler_crashers_fixed` when they are fixed. The following issues are newly tracked: TF-429, TF-756, TF-781, TF-881, TF-923, TF-928, TF-945. Some of these issues are in-progress.