Heat 1 tablespoon oil in a large skillet over medium-high heat. Add half of pork; sprinkle with 1/2 teaspoon salt and half of garlic. Cook 7 minutes, turning to brown pork on all sides. Remove pork from pan. Repeat with remaining oil, pork, salt, and garlic.
Add beer to skillet, stirring to deglaze pan. Cook 8 minutes or until liquid reduces to about 1/4 cup. Return pork to skillet, and add chicken stock, chopped chipotle chiles, and bay leaves. Bring to a boil. Cover, reduce heat, and simmer 10 minutes. Uncover and cook 4 minutes or until liquid has mostly evaporated. Remove bay leaves before serving.