isJump (CmmJump _ _) = True
isJump (CmmBranch _) = True
isJump (CmmSwitch _ _) = True
isJump (CmmReturn _) = True
isJump _ = False
isJump (CmmJump _ _) = True
isJump (CmmBranch _) = True
isJump (CmmSwitch _ _) = True
isJump (CmmReturn _) = True
isJump _ = False