JS backend: fix access to class object members from containing class with implicit receiver.

#KT-4130 Fixed

js/js.tests/test/org/jetbrains/k2js/test/semantics/ClassObjectTest.java

@@ -16,11 +16,15 @@ public final class ClassObjectTest extends SingleFileTranslationTest {
         checkFooBoxIsOk();
     }
 
-    public void testWithExtension() throws Exception {
+    public void testWithInheritance() throws Exception {
         checkFooBoxIsOk();
     }
 
     public void testSetVar() throws Exception {
         checkFooBoxIsOk();
     }
+
+    public void testAccessing() throws Exception {
+        checkFooBoxIsOk();
+    }
 }

js/js.tests/test/org/jetbrains/k2js/test/semantics/ClosureTest.java

@@ -163,4 +163,8 @@ public final class ClosureTest extends SingleFileTranslationTest {
     public void testClosureThisInLambdaInsideMethod() throws Exception {
         checkFooBoxIsOk();
     }
+
+    public void testClosureThisAndClassObject() throws Exception {
+        checkFooBoxIsOk();
+    }
 }