Make class roots an image root

Change-Id: I1f1513bf34caa736c0dd7518a92f493b4573d776
diff --git a/src/image.h b/src/image.h
index 4a2efc5..a15ead7 100644
--- a/src/image.h
+++ b/src/image.h
@@ -71,6 +71,7 @@
     kCalleeSaveMethod,
     kOatLocation,
     kDexCaches,
+    kClassRoots,
     kImageRootsMax,
   };