Fix path.scope.rename() to not change break clauses (#8478)

* Make labels on break and continue statements not referenced

* Add test for imports and labels with the same name

packages/babel-types/src/validators/isReferenced.js

@@ -80,6 +80,10 @@ export default function isReferenced(node: Object, parent: Object): boolean {
     case "RestElement":
       return false;
 
+    case "BreakStatement":
+    case "ContinueStatement":
+      return false;
+
     // no: function NODE() {}
     // no: function foo(NODE) {}
     case "FunctionDeclaration":