JS backend: added tests for reserved words.

js/js.translator/testData/reservedWords/cases/insideClassObjectLabelIn.kt

@@ -0,0 +1,19 @@
+package foo
+
+// NOTE THIS FILE IS AUTO-GENERATED by the generateTestDataForReservedWords.kt. DO NOT EDIT!
+
+class TestClass {
+    class object {
+        val t: Int = 0
+
+        fun test() {
+            testRenamed("in", { @`in` while (false) {} })
+        }
+    }
+}
+
+fun box(): String {
+    TestClass.test()
+
+    return "OK"
+}