Companion objects have public visibility by default

#KT-7114 Fixed

compiler/testData/loadJava/compiledKotlin/classObject/ClassObjectDefaultVisibility.kt

@@ -12,3 +12,20 @@ class Int {
     companion object {}
 }
 
+public class Outer {
+    public class Pub {
+        companion object {}
+    }
+
+    private class Pri {
+        companion object {}
+    }
+
+    class Int {
+        companion object {}
+    }
+
+    protected class Pro {
+        companion object {}
+    }
+}