Fix object verification.

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

Change-Id: Ie405106be81dce9a913730c7f46a5659582fa18b
diff --git a/src/oat_test.cc b/src/oat_test.cc
index c4bd60e..a2ea71c 100644
--- a/src/oat_test.cc
+++ b/src/oat_test.cc
@@ -17,6 +17,7 @@
 #include "mirror/abstract_method-inl.h"
 #include "mirror/class-inl.h"
 #include "mirror/object_array-inl.h"
+#include "mirror/object-inl.h"
 #include "oat_file.h"
 #include "oat_writer.h"
 #include "vector_output_stream.h"