message: [CMake] Pass the correct CMake directory for Swift
  Swift sets its module directory through `SWIFT_CMAKE_DIR`. We are
  currently incorrectly using `Swift_DIR` instead. This is different than
  LLVM, which is special because its modules live in the `LLVM_DIR`.
diff: @@ -73,7 +73,7 @@ endif()
  # We append the directory in which LLVMConfig.cmake lives. We expect LLVM's
  # CMake modules to be in that directory as well.
  list(APPEND CMAKE_MODULE_PATH "${LLVM_DIR}")
  -list(APPEND CMAKE_MODULE_PATH "${Swift_DIR}")
  +list(APPEND CMAKE_MODULE_PATH "${SWIFT_CMAKE_DIR}")
  include(AddLLVM)
  include(TableGen)
  include(HandleLLVMOptions)
  