Fix object verification.

Refactor VERIFY_OBJECT_ENABLED to become less brittle to change enum and global
constant.

Change-Id: Ie405106be81dce9a913730c7f46a5659582fa18b
diff --git a/src/mirror/dex_cache_test.cc b/src/mirror/dex_cache_test.cc
index 9817660..3d753e1 100644
--- a/src/mirror/dex_cache_test.cc
+++ b/src/mirror/dex_cache_test.cc
@@ -19,6 +19,7 @@
 #include "dex_cache.h"
 #include "heap.h"
 #include "mirror/object_array-inl.h"
+#include "mirror/object-inl.h"
 #include "sirt_ref.h"
 
 #include <stdio.h>