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

js/js.translator/testData/box/classObject/namedClassObject.kt

@@ -0,0 +1,33 @@
+package foo
+
+interface Named {
+    companion object Bar {
+        val g = "a";
+    }
+}
+
+class Foo {
+    companion object {
+        val g = "b";
+    }
+}
+
+fun box(): String {
+    assertEquals("a", Named.Bar.g, "Named.Bar.g")
+    assertEquals("a", Named.g, "Named.g")
+
+    assertEquals("b", Foo.Companion.g, "Foo.Companion.g")
+    assertEquals("b", Foo.g, "Foo.g")
+
+    assertEquals("b", foo(Foo), "foo(Foo)")
+    assertEquals("b", foo(Foo.Companion), "foo(Foo.Companion)")
+
+    assertEquals("c", Named.ext(), "Named.ext()")
+    assertEquals("c", Named.Bar.ext(), "Named.Bar.ext()")
+
+    return "OK"
+}
+
+fun foo(f: Foo.Companion) = f.g
+
+fun Named.Bar.ext() = "c"