Fix includes for arch_test.cc.

Change-Id: I1be8f30c7fb173568afa90764eb5909c3c230c94
diff --git a/runtime/arch/arch_test.cc b/runtime/arch/arch_test.cc
index b957d58..45ff21f 100644
--- a/runtime/arch/arch_test.cc
+++ b/runtime/arch/arch_test.cc
@@ -17,7 +17,7 @@
 #include <stdint.h>
 
 #include "common_runtime_test.h"
-#include "mirror/art_method.h"
+#include "mirror/art_method-inl.h"
 #include "quick/quick_method_frame_info.h"
 
 namespace art {