ART: Move RegisterNatives helper

Move the helper closer to the users.

Test: m test-art-host
Change-Id: Id05ce5f60af54d0c5aef0c7d8932706c4602fc94
diff --git a/runtime/native/java_lang_invoke_MethodHandleImpl.cc b/runtime/native/java_lang_invoke_MethodHandleImpl.cc
index 63168ce..2e3b4d4 100644
--- a/runtime/native/java_lang_invoke_MethodHandleImpl.cc
+++ b/runtime/native/java_lang_invoke_MethodHandleImpl.cc
@@ -24,6 +24,7 @@
 #include "mirror/field.h"
 #include "mirror/method.h"
 #include "mirror/method_handle_impl.h"
+#include "native_util.h"
 #include "runtime.h"
 #include "scoped_thread_state_change-inl.h"