Test and fixes for invoke-interface on java.lang.Object methods.

Bug: 7614818

Change-Id: I704596cf3d36887e6d6d589cb3ec89e31d5b8901
diff --git a/test/022-interface/src/ObjectOverridingInterface.java b/test/022-interface/src/ObjectOverridingInterface.java
index a44cdf5..a9e0abd 100644
--- a/test/022-interface/src/ObjectOverridingInterface.java
+++ b/test/022-interface/src/ObjectOverridingInterface.java
@@ -20,4 +20,5 @@
 public interface ObjectOverridingInterface extends CharSequence {
   public boolean equals(Object o);
   public int hashCode();
+  public String toString();
 }