Diagnostics improvements for corner cases

(class/package qualifier in non-qualifier position).

compiler/testData/diagnostics/tests/classObjects/ClassObjects.txt

@@ -4,7 +4,7 @@ package Jet86 {
     public val a: kotlin.Int = 1
     public val c: [ERROR : Type for B.x]
     public val d: [ERROR : Type for b.x]
-    public val s: java.lang.System
+    public val s: [ERROR : Type for System]
     public fun test(): kotlin.Unit
 
     public final class A {