Postpone companion object field visibility

Have to reconsider this issue because of interface companion objects.

compiler/testData/codegen/box/objects/companionObjectAccess/kt27121_lv12.kt

@@ -0,0 +1,13 @@
+// LANGUAGE_VERSION: 1.2
+
+interface A {
+    fun test() = ok()
+
+    private companion object {
+        fun ok() = "OK"
+    }
+}
+
+class C : A
+
+fun box() = C().test()