Place pork in a 5-quart oval slow cooker. Stir together cranberry sauce and next 4 ingredients. Pour cranberry mixture over pork. Cover and cook on high setting one hour; reduce heat to low setting and cook 4 1/2 hours or until pork is tender.
Skim fat from drippings in slow cooker. Measure drippings to equal 2 cups, adding water if necessary. Pour drippings into a medium saucepan; bring to a boil over medium-high heat.
Stir together cornstarch and cold water until smooth; add to drippings and cook over medium-high heat, stirring constantly, 2 to 3 minutes or until thickened. Stir in salt. Serve gravy with sliced pork.