Add presets for source compat suite.#29731

gottesmm merged 1 commit intoswiftlang:masterswiftlang/swift:masterfrom

gottesmm:pr-9ed4a1a42ee84888e7b5eb9544a6cb834c96f8cegottesmm/swift:pr-9ed4a1a42ee84888e7b5eb9544a6cb834c96f8ceCopy head branch name to clipboard