JS backend: added more tests for closures.

js/js.translator/testData/closure/cases/closureThisInLocalFunction.kt

@@ -0,0 +1,22 @@
+package foo
+
+class Foo {
+    val o = "O"
+    val k = "K"
+    fun test(): String {
+        fun bar() = o
+        fun Int.baz() = k + this
+
+        val boo = { k }
+        val cux: Int.()->String = { o + this }
+
+        return bar() + 17.baz() + 23.cux() + boo()
+    }
+}
+
+fun box(): String {
+    val a = Foo().test()
+    if (a != "OK17O23K") return "$a"
+
+    return "OK"
+}