add multiple for-of test

test/fixtures/for-of/multiple/actual.js

@@ -0,0 +1,7 @@
+for (var i of arr) {
+
+}
+
+for (var i of numbers) {
+
+}

test/fixtures/for-of/multiple/expected.js

@@ -0,0 +1,7 @@
+for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done; ) {
+  var i = _step.value;
+}
+
+for (var _iterator2 = numbers[Symbol.iterator](), _step2; !(_step2 = _iterator2.next()).done; ) {
+  var i = _step2.value;
+}