don't loose type parameter bounds during super substitution (IDEA-175471)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting8/NestedWildcardsWithImplicitBounds.java

@@ -0,0 +1,9 @@
+
+import java.io.Serializable;
+import java.util.List;
+
+interface Child<T extends Serializable> extends List<T> {
+  default void m(List<Child<?>> l) {
+    List<? extends List<? extends Serializable>> ll =  l;
+  }
+}