nested conditional expressions: don't require nested to be poly if outer is not

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/graphInference/NestedConditionalExpressions.java

@@ -0,0 +1,8 @@
+import java.util.ArrayList;
+import java.util.List;
+
+class C {
+  public static void main(Object o) {
+    List l = (List)(o instanceof ArrayList ? (ArrayList)o : o instanceof List ? (List)o : o);
+  }
+}