IDEA-151190 Change class signature doesn't support complicated bounds

java/java-tests/testData/refactoring/changeClassSignature/AddBoundWithIntersection.java

@@ -0,0 +1,9 @@
+import java.io.Serializable;
+
+class <caret>C {}
+
+class Some implements Runnable, Serializable {
+    void m() {
+      C c = new C();
+    }
+}