FIR: Refine visibility check for class members

compiler/testData/diagnostics/tests/classObjects/companionObjectOfPrivateClassVisibility.fir.kt

@@ -3,7 +3,7 @@ package test
 fun use() {
     Default.create()
 
-    Explicit.create()
+    Explicit.<!INVISIBLE_REFERENCE!>create<!>()
 }
 
 private class Default {
@@ -16,4 +16,4 @@ private class Explicit {
     private companion object {
         fun create() = Explicit()
     }
-}
+}