Fix object verification.

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

Change-Id: Ie405106be81dce9a913730c7f46a5659582fa18b
diff --git a/src/exception_test.cc b/src/exception_test.cc
index f0bec1b..1b4332f 100644
--- a/src/exception_test.cc
+++ b/src/exception_test.cc
@@ -19,6 +19,7 @@
 #include "dex_file.h"
 #include "gtest/gtest.h"
 #include "mirror/object_array-inl.h"
+#include "mirror/object-inl.h"
 #include "mirror/stack_trace_element.h"
 #include "runtime.h"
 #include "scoped_thread_state_change.h"