Allow super calls in object declarations

compiler/testData/codegen/box/objects/nestedObjectWithSuperclass.kt

@@ -0,0 +1,18 @@
+open class A (val s: Int) {
+    open fun foo(): Int {
+        return s
+    }
+}
+
+object Outer: A(1) {
+    object O: A(2) {
+        override fun foo(): Int {
+            val s = super<A>.foo()
+            return s + 3
+        }
+    }
+}
+
+fun box() : String {
+    return if (Outer.O.foo() == 5) "OK" else "fail"
+}