Improve invalid root dumping.

The invalid root dumping now attempts to print the root type.

Change-Id: Ie821296d569f34909ba6e2705f5c347cd2143a3a
diff --git a/runtime/object_callbacks.h b/runtime/object_callbacks.h
index 89ee34e..9198c90 100644
--- a/runtime/object_callbacks.h
+++ b/runtime/object_callbacks.h
@@ -56,7 +56,7 @@
     __attribute__((warn_unused_result));
 // A callback for verifying roots.
 typedef void (VerifyRootCallback)(const mirror::Object* root, void* arg, size_t vreg,
-    const StackVisitor* visitor);
+    const StackVisitor* visitor, RootType root_type);
 
 typedef void (MarkHeapReferenceCallback)(mirror::HeapReference<mirror::Object>* ref, void* arg);