JS: create new common directory for all generated tests, migrate several tests there

js/js.translator/testData/box/closure/closureInNestedLambdasInObject.kt

@@ -0,0 +1,18 @@
+// KT-4218 Nested function literal on singleton object fails
+
+package foo
+
+object SomeObject {
+    val values = create()
+    fun create() = Array<Array<String>>(1) { y ->
+        Array<String>(1) { x ->
+            "(${x}, ${y})"
+        }
+    }
+}
+
+fun box(): String {
+    if (SomeObject.values[0][0] != "(0, 0)") return SomeObject.values[0][0]
+
+    return "OK"
+}