dfa: method can still return unknown value if its arguments satisfy nullity conditions (IDEA-106205)

java/java-tests/testData/inspection/dataFlow/fixture/IsNotNullCheck.java

@@ -4,6 +4,13 @@ public class IsNotNullCheck {
      if (Value.isNotNull(v)) {
        if(<warning descr="Condition 'v == null' is always 'false'">v == null</warning>) {}
      }
+   }
+   void bar2() {
+     final Value v = call();
+     System.out.println(v.hashCode());
+     if (Value.isNotNull(v)) {
+
+     }
    }
     Value call() {return new Value();}
 }