ART: More header cleanups

Pull out more dependencies through forward declarations.

Test: m test-art-host
Change-Id: I7d86726928937f788b956ec9eac91532d66d57ae
diff --git a/runtime/jit/jit_code_cache.cc b/runtime/jit/jit_code_cache.cc
index 388a517..0cafac7 100644
--- a/runtime/jit/jit_code_cache.cc
+++ b/runtime/jit/jit_code_cache.cc
@@ -35,6 +35,7 @@
 #include "mem_map.h"
 #include "oat_file-inl.h"
 #include "oat_quick_method_header.h"
+#include "object_callbacks.h"
 #include "scoped_thread_state_change-inl.h"
 #include "stack.h"
 #include "thread_list.h"