Refactor unwind from Option to a new enum

compiler/rustc_mir_dataflow/src/move_paths/builder.rs

@@ -398,7 +398,7 @@ impl<'b, 'a, 'tcx> Gatherer<'b, 'a, 'tcx> {
                 ref args,
                 destination,
                 target,
-                cleanup: _,
+                unwind: _,
                 from_hir_call: _,
                 fn_span: _,
             } => {
@@ -417,7 +417,7 @@ impl<'b, 'a, 'tcx> Gatherer<'b, 'a, 'tcx> {
                 options: _,
                 line_spans: _,
                 destination: _,
-                cleanup: _,
+                unwind: _,
             } => {
                 for op in operands {
                     match *op {