[java-incomplete-model] Assume that any unresolved class-type is assignable to java.lang.Object

Partially improves inference in incomplete mode

GitOrigin-RevId: 1d9c7c75afd524ea02980be8f96c19fba1eaaf54

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamToLoop/afterCollector.java

@@ -115,7 +115,7 @@ public class Main {
 
   // Unresolved reference
   void f(Collection<? extends Foo> c) {
-      R treeSet = new TreeSet();
+      TreeSet treeSet = new TreeSet();
       for (Foo foo : c) {
           treeSet.add(foo);
       }