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

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

@@ -0,0 +1,31 @@
+package foo
+
+open class A {
+    val a = 3
+    fun foo(): Int {
+        return 5
+    }
+    companion object: A() {
+        val c = a
+    }
+}
+
+class B {
+    companion object: A() {
+    }
+}
+
+fun box(): String {
+    if (A.a != 3) return "A.a != 3, it: ${A.a}"
+    if (A.foo() != 5) return "A.foo() != 5, it: ${A.foo()}"
+
+    val a = A
+    if (a.c != 3) return "a = A; a.c != 3, it: ${a.c}"
+
+    if (A().a != 3) return "A().a != 3, it: ${A().a}"
+
+    if (B.a != 3) return "B.a != 3, it: ${B.a}"
+    val b = B
+    if (b.foo() != 5) return "b = B; b.foo() != 5, it: ${b.foo()}"
+    return "OK"
+}